Fits 1955-68 Chevy small block short water pump pulley is a double (2) groove black steel water pump pulley. Depth: 2.875".
For 55-68 Chevy Small Block Black Steel 1 Groove Crankshaft Short Water Pulley
For 1969-1985 Chevy Small Block EDP Black Steel 1 Groove Long Water Pump Pulley
Crankshaft Pulley Black Steel, 3 Groove 1965-69 Ford SB w/289/302 V8 [105-7121B]
Small Block Chevy Chrome Steel 2 Groove Short Water Pump Pulley 283 327 SBC SWP