Fits 1989 to 1998.5 12 Valve Cummins engine with stock gear housing featuring custom design to add contrast to the front of your gear housing. Billet gear housing cover requires factory gasket (not included), designed to use factory fan with stock dampener and belt without modification. Includes Stainless Steel hardware. Allows installation of aftermarket mechanical fuel supply pump, features slotted access to adjustable cam timing gear, and access cover to adjustable injection pump gear. Includes crank seal ring (does not include crank seal).