For 1971-73 Mercury Cougars and Ford Mustangs with the 351W engine manufactured after 10-26-1970. This is a Pitts manufactured pulley and clutch assembly with a pulley diameter of 6-5/16", a clutch diameter of 5-1/8", and an overall thickness of 1-11/16 inches.
Ford part # D1OA-2981-A. May also have part numbers D1OA-2981-AA, D1OA-2981-A1A, D1OA-2981-A1B, D1OA-2981-A2A, and D1OA-2981-A2B.