Allstar 16 inch Diameter 5-1/8 inch Flange Plain Aluminum Carburetor Air Cleaner Kit with 1/2 inch Spacer is designed for use with a 16 inch diameter air filter element. It is sold separately. The kit includes a top, bottom, 1 inch spacer with o-ring seal to keep contaminants out of the engine and is designed for a 5-1/8 inch carburetor flange. It is constructed from quality aluminum and features a plain finish. It will not clear with hei distributors and must use Allstar part 26095 offset air cleaner kit if using hei type distributors. It is backed by a 90-day limited factory and sold individually.