Proform 9 Inch Full-Flo Style air cleaner fits 5.125 inch carb necks. Chrome plated steel with plain top and flat base. Includes 2 inch white paper air filter, zinc plated studs, wing nut, and PCV attachment for use in pollution controlled motor vehicles. Sold as a kit. Minimum clearance of 3.75 inches is required from the top of the carburetor gasket area to the underside of the hood.