1.5 Ratio Performance Roller Rocker Arm Assembly opt high perf heads these come STD with clean Brand New Bosch High these come STD with clean flowing cooling vanes for maximum cooling through the head and around the intake ports for increased HP and overall cooling MAKE MODEL YEAR BODY TYPE Volkswagen Beetle 1949 1970 Convertible Volkswagen Beetle 1949 1977 Sedan Volkswagen Beetle 1949 1977 Sunroof Volkswagen Bus 1950 1967 Split Window Volkswagen Bus 1968 1971 Bay Window Volkswagen Karmann Ghia 1956 1974 Coupe Volkswagen Karmann Ghia 1957 1974 Convertible Volkswagen Super Beetle 1971 1977 Sedan Volkswagen Super Beetle 1971 1977 Sunroof Volkswagen Super Beetle 1971 1979 Convertible Volkswagen Thing 1973 1974 Base Part #: TM 1530 R They are also drilled through on the alloy adjusting screws and shims are high strength alloy as well