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Availability: Special Order*
SKU: 1629-1
Manufacturer: COMP Cams
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$42.95

The Ultra Pro Magnum Roller Rocker Arms for Chevy V8 348-409 applications not only live up to the lofty standards of the original Pro Magnums, but they also take stud mount rocker performance, stability and value to a whole new level. These rocker arms feature a 3/8" stud diameter and 1.7 ratio. The 8650 chromemoly material and arched, web-like design deliver increased strength and rigidity while still reducing the moment of inertia and optimizing the dynamic balance. A unique black oxide exterior finish helps prevent corrosion and increases durability. Featuring oversized trunions, precision-sorted needle bearings and hardened roller tips for the ultimate in performance and dependability. Optimized retainer and valve spring clearances allow for use of most diameter springs, retainers and +.050" locks without clearance or fitment issues.

For 348-409 Chevrolet V8 applications, 1.7 ratio, 3/8" studs; Investment cast 8650 chromemoly body and arched, web-like design deliver increased strength and rigidity while reducing moment of inertia; Unique black oxide exterior finish helps prevent corrosion, thus increasing durability; Optimized retainer and valve spring clearances allow use of most diameter springs, retainers and +.050" locks without clearance or fitment issues; Feature oversized trunions, precision sorted needle bearings and hardened roller tips

This Ultra Pro Magnum rocker is made of black oxide coated 8650 chromemoly steel that can withstand up to 850 lbs of spring pressure. Featuring a 1.7 ratio, this rocker fits Chevrolet 348-409 with a 3/8" diameter stud.

COMP Cams Ultra Pro Magnum Roller Rocker Arm, 1.7 Ratio, 3/8" Stud Diameter for 348, 409 Chevrolet, Single Piece

Ultra Pro Magnum Rocker Arm w/ 1.7 Ratio for Chevrolet 348-409 w/ 3/8" Stud

Rocker Arm,348/409 Chevy 1.7 Ult.Pro Mag

COMP Cams Rocker Arm348/409 Chevy 1.7 U

Ultra Pro 1.7 Chev 348-409 3/8 Stud

Engine Rocker Arm

None

The Ultra Pro Magnum Roller Rocker Arms for Chevy V8 348-409 applications not only live up to the lofty standards of the original Pro Magnums, but they also take stud mount rocker performance, stability and value to a whole new level. These rocker arms feature a 3/8" stud diameter and 1.7 ratio. The 8650 chromemoly material and arched, web-like design deliver increased strength and rigidity while still reducing the moment of inertia and optimizing the dynamic balance. A unique black oxide exterior finish helps prevent corrosion and increases durability. Featuring oversized trunions, precision-sorted needle bearings and hardened roller tips for the ultimate in performance and dependability. Optimized retainer and valve spring clearances allow for use of most diameter springs, retainers and +.050" locks without clearance or fitment issues.

For 348-409 Chevrolet V8 applications, 1.7 ratio, 3/8" studs; Investment cast 8650 chromemoly body and arched, web-like design deliver increased strength and rigidity while reducing moment of inertia; Unique black oxide exterior finish helps prevent corrosion, thus increasing durability; Optimized retainer and valve spring clearances allow use of most diameter springs, retainers and +.050" locks without clearance or fitment issues; Feature oversized trunions, precision sorted needle bearings and hardened roller tips

This Ultra Pro Magnum rocker is made of black oxide coated 8650 chromemoly steel that can withstand up to 850 lbs of spring pressure. Featuring a 1.7 ratio, this rocker fits Chevrolet 348-409 with a 3/8" diameter stud.

COMP Cams Ultra Pro Magnum Roller Rocker Arm, 1.7 Ratio, 3/8" Stud Diameter for 348, 409 Chevrolet, Single Piece

Ultra Pro Magnum Rocker Arm w/ 1.7 Ratio for Chevrolet 348-409 w/ 3/8" Stud

Rocker Arm,348/409 Chevy 1.7 Ult.Pro Mag

COMP Cams Rocker Arm348/409 Chevy 1.7 U

Ultra Pro 1.7 Chev 348-409 3/8 Stud

Engine Rocker Arm

None

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Vehicle Fitment

Chevrolet

    R3500

      1989 Cheyenne - 1989 Scottsdale - 1989 Silverado

    V3500

      1989 Cheyenne - 1989 Scottsdale - 1989 Silverado

    R30

      1988 Custom Deluxe - 1988 Scottsdale - 1988 Silverado - 1988 Cheyenne - 1987 Silverado - 1987 Custom Deluxe - 1987 Scottsdale

    V30

      1988 Cheyenne - 1988 Scottsdale - 1988 Silverado - 1988 Custom Deluxe - 1987 Custom Deluxe - 1987 Scottsdale - 1987 Silverado

    C20

      1986 Custom - 1986 Scottsdale - 1986 Silverado - 1985 Silverado - 1985 Scottsdale - 1985 Custom - 1984 Silverado - 1984 Scottsdale - 1984 Custom - 1983 Silverado - 1983 Custom - 1983 Scottsdale - 1982 Silverado - 1982 Scottsdale - 1982 Custom - 1981 Deluxe - 1981 Custom - 1981 Silverado - 1981 Scottsdale - 1981 Cheyenne - 1980 Cheyenne - 1980 Silverado - 1980 Custom Deluxe - 1980 Scottsdale - 1979 Cheyenne - 1979 Scottsdale - 1979 Custom Deluxe - 1979 Silverado - 1978 Cheyenne - 1978 Custom Deluxe - 1978 Scottsdale - 1978 Silverado - 1977 Cheyenne - 1977 Custom Deluxe - 1977 Scottsdale - 1977 Silverado - 1976 Cheyenne - 1976 Custom Deluxe - 1976 Silverado - 1976 Scottsdale - 1975 Custom Deluxe - 1975 Cheyenne - 1975 Scottsdale - 1975 Silverado

    C20 Suburban

      1986 Custom - 1986 Scottsdale - 1986 Silverado - 1985 Custom - 1985 Silverado - 1985 Scottsdale - 1984 Custom - 1984 Silverado - 1984 Scottsdale - 1983 Custom - 1983 Silverado - 1982 Custom - 1982 Silverado - 1982 Scottsdale - 1981 Custom - 1981 Deluxe - 1980 Custom Deluxe - 1980 Scottsdale - 1980 Silverado - 1979 Silverado - 1979 Scottsdale - 1979 Custom Deluxe - 1978 Custom Deluxe - 1978 Scottsdale - 1977 Silverado - 1977 Scottsdale - 1977 Custom Deluxe - 1976 Silverado - 1976 Custom Deluxe - 1976 Scottsdale - 1975 Custom Deluxe - 1975 Scottsdale - 1975 Silverado - 1974 Base - 1973 Base - 1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base

    C30

      1986 Custom - 1986 Scottsdale - 1986 Silverado - 1985 Scottsdale - 1985 Silverado - 1985 Custom - 1984 Custom - 1984 Silverado - 1984 Scottsdale - 1983 Silverado - 1983 Custom - 1983 Scottsdale - 1982 Custom - 1982 Silverado - 1982 Scottsdale - 1981 Custom - 1981 Deluxe - 1981 Scottsdale - 1981 Silverado - 1981 Cheyenne - 1980 Cheyenne - 1980 Custom Deluxe - 1980 Scottsdale - 1980 Silverado - 1979 Cheyenne - 1979 Silverado - 1979 Scottsdale - 1979 Custom Deluxe - 1978 Cheyenne - 1978 Custom Deluxe - 1978 Scottsdale - 1978 Silverado - 1977 Cheyenne - 1977 Silverado - 1977 Custom Deluxe - 1977 Scottsdale - 1976 Cheyenne - 1976 Scottsdale - 1976 Custom Deluxe - 1976 Silverado - 1975 Cheyenne - 1975 Silverado - 1975 Custom Deluxe - 1975 Scottsdale

    K30

      1986 Silverado - 1986 Scottsdale - 1986 Custom - 1985 Custom - 1985 Scottsdale - 1985 Silverado - 1984 Scottsdale - 1984 Custom - 1984 Silverado - 1983 Scottsdale - 1983 Custom - 1983 Silverado - 1982 Silverado - 1982 Scottsdale - 1982 Custom - 1981 Silverado - 1981 Cheyenne - 1981 Scottsdale - 1981 Deluxe - 1981 Custom - 1980 Cheyenne - 1980 Custom Deluxe - 1980 Scottsdale - 1980 Silverado - 1977 Cheyenne - 1977 Scottsdale - 1977 Custom Deluxe - 1977 Silverado

    K20 Suburban

      1985 Custom - 1985 Scottsdale - 1985 Silverado - 1973 Base

    C10

      1980 Big Ten - 1980 Cheyenne - 1980 Custom Deluxe - 1980 Scottsdale - 1980 Silverado - 1979 Silverado - 1979 Big Ten - 1979 Custom Deluxe - 1979 Scottsdale - 1979 Cheyenne - 1978 Cheyenne - 1978 Scottsdale - 1978 Custom Deluxe - 1978 Big Ten - 1978 Silverado - 1977 Cheyenne - 1977 Custom Deluxe - 1977 Silverado - 1977 Scottsdale - 1976 Custom Deluxe - 1976 Cheyenne - 1976 Scottsdale - 1976 Silverado - 1975 Cheyenne - 1975 Custom Deluxe - 1975 Silverado - 1975 Scottsdale

    C10 Suburban

      1980 Custom Deluxe - 1980 Scottsdale - 1980 Silverado - 1979 Silverado - 1979 Scottsdale - 1979 Custom Deluxe - 1978 Silverado - 1978 Custom Deluxe - 1978 Scottsdale - 1977 Scottsdale - 1977 Silverado - 1977 Custom Deluxe - 1976 Custom Deluxe - 1976 Silverado - 1976 Scottsdale - 1975 Silverado - 1975 Custom Deluxe - 1975 Scottsdale - 1974 Base - 1973 Base - 1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base

    K10

      1980 Cheyenne - 1980 Custom Deluxe - 1980 Scottsdale - 1980 Silverado - 1979 Cheyenne - 1979 Custom Deluxe - 1979 Scottsdale - 1979 Silverado - 1976 Cheyenne - 1976 Custom Deluxe - 1976 Silverado - 1976 Scottsdale

    K20

      1980 Cheyenne - 1980 Custom Deluxe - 1980 Scottsdale - 1980 Silverado - 1978 Silverado - 1978 Cheyenne - 1978 Scottsdale - 1978 Custom Deluxe - 1977 Custom Deluxe - 1977 Scottsdale - 1977 Cheyenne - 1977 Silverado - 1976 Custom Deluxe - 1976 Cheyenne - 1976 Silverado - 1976 Scottsdale

    K5 Blazer

      1978 Cheyenne - 1978 Custom Deluxe - 1978 Silverado - 1977 Custom Deluxe - 1977 Cheyenne - 1976 Base - 1976 Cheyenne

    Caprice

      1976 Classic - 1976 Classic Landau - 1976 Classic Sport - 1976 Classic Estate - 1975 Estate Wagon - 1975 Classic Sport - 1975 Classic - 1974 Classic - 1974 Estate - 1973 Classic - 1973 Estate - 1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base - 1967 Base - 1966 Base

    G20

      1976 Beauville - 1976 Chevy Van

    G30

      1976 Beauville - 1976 Chevy Van - 1976 Hi-Cube - 1975 Hi-Cube - 1975 Chevy Van - 1975 Beauville

    Impala

      1976 Base - 1976 S - 1976 Sport - 1976 Custom - 1976 Custom Landau - 1975 Base - 1975 Sport - 1975 Custom - 1974 Base - 1973 Base - 1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base - 1967 Base - 1967 SS - 1966 Base - 1966 SS - 1965 SS - 1965 Base - 1963 Base

    Bel Air

      1975 Base - 1974 Base - 1973 Base - 1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base - 1967 Base - 1966 Base - 1965 Base - 1963 Base

    El Camino

      1975 Base - 1974 Base - 1974 Custom - 1974 SS - 1973 Base - 1973 Custom - 1973 SS - 1972 Base - 1972 Custom - 1972 SS - 1971 Base - 1971 Custom - 1971 SS - 1970 Base - 1970 Custom - 1970 SS - 1969 Base - 1969 Custom - 1969 SS - 1968 Base - 1968 Custom - 1968 SS - 1967 Base - 1966 Base

    Laguna

      1975 Base - 1975 S3 - 1974 Base - 1974 Type S-3 - 1973 Base - 1973 Estate

    Malibu

      1975 Classic - 1974 Base - 1974 Classic - 1974 Estate - 1973 Base - 1973 Estate - 1967 Base - 1966 Base

    Monte Carlo

      1975 S - 1974 Base - 1974 Landau - 1973 Base - 1973 Landau - 1973 S - 1972 Base - 1971 Base - 1970 Base

    C10 Pickup

      1974 Base - 1973 Base - 1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base

    C20 Pickup

      1974 Base - 1973 Base - 1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base

    C30 Pickup

      1974 Base - 1973 Base - 1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base

    Corvette

      1974 Base - 1973 Base - 1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base - 1967 Base - 1966 Base

    G10 Van

      1974 Base - 1973 Base

    G20 Van

      1974 Base - 1974 Sportvan - 1973 Base - 1973 Sportvan

    G30 Van

      1974 Base - 1973 Base

    K10 Pickup

      1974 Base - 1969 Base - 1968 Base

    K20 Pickup

      1974 Base - 1973 Base - 1969 Base - 1968 Base

    K30 Pickup

      1974 Base - 1973 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base

    Blazer

      1973 Base

    Chevelle

      1973 Deluxe - 1972 Base - 1972 Concours - 1972 Concours Estate - 1972 Greenbrier - 1972 Malibu - 1972 Nomad - 1972 SS - 1971 Base - 1971 Concours - 1971 Concours Estate - 1971 Greenbrier - 1971 Malibu - 1971 Nomad - 1971 SS - 1970 Base - 1970 Concours - 1970 Concours Estate - 1970 Greenbrier - 1970 Malibu - 1970 Nomad - 1970 SS - 1969 300 Deluxe - 1969 Concours - 1969 Concours Estate - 1969 Greenbrier - 1969 Malibu - 1969 Nomad - 1969 SS - 1968 300 - 1968 300 Deluxe - 1968 Concours - 1968 Malibu - 1968 Nomad - 1968 SS - 1967 Base - 1967 Concours - 1967 SS - 1967 Deluxe - 1966 Base - 1966 SS - 1965 Base - 1965 SS

    Biscayne

      1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base - 1967 Base - 1966 Base - 1965 Base - 1963 Base

    Brookwood

      1972 Base - 1961 Base - 1960 Base - 1959 Base - 1958 Base

    Camaro

      1972 Base - 1972 Z28 - 1972 SS - 1971 Base - 1971 SS - 1970 Base - 1970 SS - 1969 Base - 1969 RS - 1969 SS - 1968 Base - 1968 SS - 1967 Base - 1967 RS - 1967 SS

    K10 Suburban

      1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base

    Kingswood

      1972 Base - 1972 Estate - 1971 Base - 1971 Estate - 1970 Base - 1970 Estate

    Townsman

      1972 Base - 1970 Base

    Nova

      1970 Base - 1969 Base

    Chevy II

      1968 Nova

    P30 Series

      1965 Base - 1964 Base - 1963 Base - 1962 Base

    Del Ray

      1958 Base

GMC

    R3500

      1989 Base - 1989 Sierra Classic - 1989 High Sierra - 1988 Sierra Classic - 1988 Base - 1988 High Sierra - 1987 High Sierra - 1987 Base - 1987 Sierra Classic

    V3500

      1989 Base - 1989 High Sierra - 1989 Sierra Classic - 1988 Base - 1988 High Sierra - 1988 Sierra Classic - 1987 Base - 1987 High Sierra - 1987 Sierra Classic

    C2500

      1986 Base - 1986 High Sierra - 1986 Sierra Classic - 1985 Sierra Classic - 1985 High Sierra - 1985 Base - 1984 Base - 1984 High Sierra - 1984 Sierra Classic - 1983 Sierra Classic - 1983 High Sierra - 1983 Base - 1982 High Sierra - 1982 Base - 1982 Sierra Classic - 1982 Sierra Grande - 1981 Sierra Grande - 1981 Sierra Classic - 1981 Base - 1981 High Sierra - 1980 High Sierra - 1980 Base - 1980 Sierra Classic - 1980 Sierra Grande - 1979 Sierra Grande - 1979 Sierra Classic - 1979 Base - 1979 High Sierra

    C2500 Suburban

      1986 Base - 1986 High Sierra - 1986 Sierra Classic - 1985 Base - 1985 High Sierra - 1985 Sierra Classic - 1984 High Sierra - 1984 Base - 1984 Sierra Classic - 1983 Base - 1983 High Sierra - 1983 Sierra Classic - 1982 High Sierra - 1982 Base - 1982 Sierra Classic - 1982 Sierra Grande - 1981 Base - 1981 High Sierra - 1981 Sierra Grande - 1981 Sierra Classic - 1980 High Sierra - 1980 Base - 1980 Sierra Classic - 1980 Sierra Grande - 1979 Base - 1979 High Sierra - 1979 Sierra Classic - 1979 Sierra Grande

    C3500

      1986 Base - 1986 High Sierra - 1986 Sierra Classic - 1985 Sierra Classic - 1985 High Sierra - 1985 Base - 1984 Base - 1984 High Sierra - 1984 Sierra Classic - 1983 Sierra Classic - 1983 High Sierra - 1983 Base - 1982 Base - 1982 High Sierra - 1982 Sierra Classic - 1982 Sierra Grande - 1981 Base - 1981 Sierra Classic - 1981 High Sierra - 1981 Sierra Grande - 1980 Base - 1980 High Sierra - 1980 Sierra Classic - 1980 Sierra Grande - 1979 Base - 1979 Sierra Grande - 1979 Sierra Classic - 1979 High Sierra

    K3500

      1986 Sierra Classic - 1986 Base - 1986 High Sierra - 1985 High Sierra - 1985 Base - 1985 Sierra Classic - 1984 Sierra Classic - 1984 Base - 1984 High Sierra - 1983 High Sierra - 1983 Base - 1983 Sierra Classic - 1982 Sierra Classic - 1982 Sierra Grande - 1982 Base - 1982 High Sierra - 1981 High Sierra - 1981 Base - 1981 Sierra Grande - 1981 Sierra Classic - 1980 Sierra Classic - 1980 Sierra Grande - 1980 Base - 1980 High Sierra - 1979 Base - 1979 Sierra Classic - 1979 High Sierra - 1979 Sierra Grande

    C1500

      1980 Base - 1980 High Sierra - 1980 Sierra Classic - 1980 Sierra Grande - 1980 Street Coupe - 1980 Heavy Half - 1979 Heavy Half - 1979 Base - 1979 Street Coupe - 1979 Sierra Grande - 1979 Sierra Classic - 1979 High Sierra

    C1500 Suburban

      1980 Base - 1980 High Sierra - 1980 Sierra Classic - 1980 Sierra Grande - 1979 Sierra Grande - 1979 Base - 1979 Sierra Classic - 1979 High Sierra

    K1500

      1980 Base - 1980 High Sierra - 1980 Sierra Classic - 1980 Sierra Grande - 1979 Sierra Grande - 1979 Sierra Classic - 1979 High Sierra - 1979 Base

    C15

      1978 Base - 1978 High Sierra - 1978 Sierra Classic - 1978 Sierra Grande - 1978 Street Coupe - 1978 Heavy Half - 1977 Sierra Grande - 1977 Heavy Half - 1977 Sierra Classic - 1977 Indy Hauler - 1977 High Sierra - 1977 Base - 1976 Base - 1976 High Sierra - 1976 Sierra Classic - 1976 Sierra Grande - 1975 Base - 1975 Sierra Grande - 1975 Sierra Classic - 1975 High Sierra

    C15 Suburban

      1978 Base - 1978 Sierra Grande - 1978 High Sierra - 1978 Sierra Classic - 1977 High Sierra - 1977 Base - 1977 Sierra Grande - 1977 Sierra Classic - 1976 Base - 1976 Sierra Grande - 1976 High Sierra - 1976 Sierra Classic - 1975 High Sierra - 1975 Base - 1975 Sierra Grande - 1975 Sierra Classic

    C25

      1978 Base - 1978 High Sierra - 1978 Sierra Classic - 1978 Sierra Grande - 1977 High Sierra - 1977 Base - 1977 Sierra Grande - 1977 Sierra Classic - 1976 High Sierra - 1976 Sierra Classic - 1976 Base - 1976 Sierra Grande - 1975 High Sierra - 1975 Base - 1975 Sierra Grande - 1975 Sierra Classic

    C25 Suburban

      1978 Base - 1978 High Sierra - 1978 Sierra Classic - 1978 Sierra Grande - 1977 Sierra Grande - 1977 Sierra Classic - 1977 High Sierra - 1977 Base - 1976 High Sierra - 1976 Base - 1976 Sierra Classic - 1976 Sierra Grande - 1975 Sierra Grande - 1975 High Sierra - 1975 Sierra Classic - 1975 Base

    C35

      1978 Sierra Grande - 1978 High Sierra - 1978 Sierra Classic - 1978 Base - 1977 High Sierra - 1977 Base - 1977 Sierra Grande - 1977 Sierra Classic - 1976 Sierra Grande - 1976 High Sierra - 1976 Sierra Classic - 1976 Base - 1975 High Sierra - 1975 Base - 1975 Sierra Grande - 1975 Sierra Classic

    K25

      1978 High Sierra - 1978 Sierra Classic - 1978 Sierra Grande - 1978 Base - 1977 Base - 1977 High Sierra - 1977 Sierra Classic - 1977 Sierra Grande - 1976 High Sierra - 1976 Base - 1976 Sierra Grande - 1976 Sierra Classic

    K25 Suburban

      1977 Sierra Grande - 1977 Sierra Classic - 1977 Base - 1977 High Sierra - 1976 Base - 1976 Sierra Classic - 1976 High Sierra - 1976 Sierra Grande

    G25

      1976 Rally STX - 1976 Rally - 1975 Rally - 1975 Rally STX

    G35

      1976 Magnavan

    Jimmy

      1976 Base - 1976 High Sierra - 1976 Sierra Classic - 1976 Sierra Grande - 1973 Base

    K15

      1976 Base - 1976 High Sierra - 1976 Sierra Classic - 1976 Sierra Grande

    Sprint

      1975 Base - 1975 High Sierra - 1975 SP - 1975 Classic - 1974 Base - 1974 Custom - 1973 Base - 1973 Custom - 1972 Base - 1972 Custom - 1971 Base

    C15/C1500 Pickup

      1974 Base - 1973 Base - 1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base

    C15/C1500 Suburban

      1974 Base - 1973 Base - 1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base

    C25/C2500 Pickup

      1974 Base - 1973 Base - 1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base

    C25/C2500 Suburban

      1974 Base - 1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base

    C35/C3500 Pickup

      1974 Base - 1973 Base - 1972 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base

    K15/K1500 Suburban

      1974 Base - 1972 Base - 1971 Base - 1970 Base - 1968 Base

    K25/K2500 Pickup

      1974 Base - 1973 Base - 1969 Base - 1968 Base

    K25/K2500 Suburban

      1974 Base - 1968 Base

    K35/K3500 Pickup

      1974 Base - 1973 Base - 1971 Base - 1970 Base - 1969 Base - 1968 Base

    K15/K1500 Pickup

      1969 Base - 1968 Base
*we take fitment seriously and have invested heavily into matching products to your vehicle, but it is up to the end user to confirm products are suitable for their vehicle, legal for them to use for the purposes they intend, and verify fitment upon installation. Many opened products may not be returned, so if fitment is in question, please contact us before ordering. We are not resonsible for any costs incurring from a product not being suitable to an end users application.