Crank pulley assembly for 1986-1993 Ford 5.0 Mustang applications. Includes crank pulley, mounting hardware, and appropriate drive belt for use with 3.33" supercharger pulley. 8-Rib and 10-Rib supercharger drive pulleys feature single crank pulley design that accommodates both accessory and supercharger drive belts, with standard or underdrive 6-Rib accessory drive.