Black cast aluminum primary cover; directly influenced by the early tin diamond primary covers; as used by Captain America & Billy in the 1969 Easy Riders motion picture; hence the name Billy Boy. The perfect match for your trip back in time. Re-use stock mounting hardware. Gaskets must be ordered separately. Note: A large diameter starter shaft bushing; for 89-93 models; is pre-installed. For 94-06 models the small diameter starter shaft bushing (950690/33446-94A) must be ordered separately and installed.