The pulley is a single (1) groove pulley and fits all Chevy / GM key-way units through 1972.
AC Condenser A/C Air Conditioning for Buick Chevy GM V8 V6 New
New Throttle Position Sensor and Idle Air Control Valve Set For LS Chevy GM
Throttle Position Sensor & Idle Air Control Valve Set TPS IAC For LS Chevy GM
Throttle Position Sensor and Idle Air Control TPS IAC Valve Set For LS Chevy GM
Cylinder Intake Manifold Upper Lower Gasket for Buick Chevy GM Cadillac 12673301