Air horn conversion kits for Super E & G carbs on Harley-Davidson® motorcycles include air horn, three mounting screws, carb support bracket, and two longer bottom carb to manifold mounting bolts and 11-2084 enrichment device. Bracket connects the center crankcase bolt to the bottom manifold carburetor mounting bolt. Everything you need to get this velocity stack on your bike and running down the road. 100% Made In America. Part #17-0484