They are not available NOS anymore and are the same for both the L48 and LT1. They are fairly easy to find on eBay or swap meets. I can get the old part number for you if you really want it. On used ones make sure to take a look at the bottom and make sure that the timming chain hasnt grooved the metal out too thin.
Team Camaro Gold Member #14
1967 Camaro RS/z28 - one of 602 made - SOLD
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1969 Camaro RS/SS L48 4 speed
1974 Camaro LT-Z/28 4 speed 33K orig miles
1979 Camaro Z/28 36K orig miles
1987 Monte Carlo SS 25K orig mi bought new by me.