Air Cleaner Inlet Base Diameter (in): 5.125 in. Air Cleaner Adapter Material: Plastic Air Cleaner Adapter Finish: Black Quantity: Sold individually. Air Cleaner Adapter, Plastic, Black, 2 5/8 in. Carburetor Inlet to 5 1/8 in. Air Cleaner Opening, Each Raise up your air cleaner the right amount. These Mr. Gasket air cleaner spacers are designed to fit between your carburetor neck flange and the air filter assembly. They come in different heights to allow the amount of clearance you need for your application.