Used crank shaft pulley for any 1970 Mercury Cougar or Ford Mustang with Boss 302 engine. This is a double groove pulley with a 5-13/16 inch inner pulley diameter, pulley turns the water pump and alternator. 6-5/8 inches diameter for the smog pump belt. This pulley would have been used without power steering. Also used only up until about Jan, 1970. After Jan 1970, Ford just installed a 3 sheave pulley with the middle sheave not being used.
Replaces Ford part number D0ZE-6312-A.