S&S Cycle SS31-6206 Oil Pump w/Universal Cover Polished for Big Twin 92-99Fitment: 1992 '99 HD big twin. Features & Benefits: Universial cover. Machined with an oil pressure relief bleed off valve to maintain consistent oil pressure from the time the engine is started to the time it's shut off. Oil pressure regulation bypass route allows excess oil not used by the engine to return directly to the supply side of the pump, reducing foaming and cavitation. No thicker than a stock pump. Equipped with a stock length oil pump