S&S polished billet oil pump kit with universal cover fits 1984-1991 HD® Big Twins. This high volume, high pressure pump only kit includes supply gears, return gears, drive shaft, drive shaft keys, drive shaft snap rings, check ball, check ball spring, pressure valve, pressure valve spring, cover screws with o-rings, miscellaneous hose fittings, plugs, screws, paper gaskets, and mounting hardware.