Fits any Holley or Holley-style square bore 4150 / 4160 four barrel carburetor AED HO Series 4150 Carbs. Quick Fuel 4150 / 4160 Style Carbs: Race-Q, P Series, Q Series, SS Series, HR Series. Fits Holley Fuel Pressure Regulators: 12-803, 12-804, 12-500, 12-501 or 12-803BP.
