The pulley is a single (1) groove pulley and fits all Chevy / GM key-way units through 1972.
Pypes GM Tailpipe Hangers for 64-72 Chevy GM A-Body HGH10
VINTAGE USED 1969-1974 CHEVY, GM, OLDS (AND MORE) PULLEY GM #1238316
FOR CHEVY GM LS Turbo Exhaust Hotparts T4 Kit Vortec 4.8 5.3 6.0 LSX Manifolds
ARP Rod Bolt Kit for Chevy/GM 6.6L Duramax Diesel - 230-6301
Transmission Oil Cooler For 2001-05 GM Chevy Silverado Sierra 6.6L Duramax,Aluminum Intercooler Radiator
3 Row Universal 22'' Wide Radiator Replacement for Chevy GM SBC BBC Cooling Aluminum Radiators with Electric Cooling Fan Crossflow 22''X19''