Fits 12 Valve Cummins engine with stock gear housing. Requires factory gasket (not included), can use factory fan with stock 12 valve dampener and belt. Includes Stainless Steel hardware. Allows installation of aftermarket mechanical fuel supply pump. Includes crank seal adapter ring (does not include crank seal). Custom engraving also available for additional charge, call for pricing. Photo 2 shown with Waterman aux pump which sells separately. Last picture shows optional pump cover plate for Waterman style fuel pump driven off injection pump gear instead of driven off aux/ power steering pump gear..