You are bidding on a Pontiac Water Pump Pulley # 9778808 - It came off a 1966 389 that was in a GTO back in the day - It is 8" across - 2 grooves - Lays flat - This will work with any Pontiac V8 water pump 64 - 67 - This used & needs to be painted - Made in The USA NO CHINA CRAP!!!! Thanks for bidding