This Edelbrock part # 15879 conversion kit is intended to upgrade the factory Ford 5.0L Coyote 6-rib belt drive system to an 8-rib to help reduce belt slip encountered in high boost applications with a smaller pulley. It is an ideal upgrade for E-Force equipped 2011-17 Mustang GT, F-150 or crate engine. Kit includes water pump pulley, alternator pulley, harmonic damper, all necessary idler pulleys and tensioners and hardware. E-Force 8-rib supercharger pulleys are sold separately and are available in sizes from 2.625" to 3.25". Will require the purchase of Edelbrock FEAD bracket #24-158833 when used on Mustang applications and #24-158844 for F-150 applications.