Super G carburetor. Shovel fits all engines 1979-1982 with rubber band style heads. Super G carbs have a 2 1/16 inch throat and are recommended for use on a 74 C.I. and larger displacement H-D Big Twin and Sportster (not 883cc or 900cc) engines --- primarily those engines where some performance modifications usch as head porting, a cam change, big bore cylinders, stroker flywheels, etc., have been done or are going to be done. Call 1-800-366-3464 for price.