This is for a 1964 - 1965 Chevy Small block 4 barrel carburetor (bbl) Air Cleaner Assembly (M-3359-5 1/8 Inch). You will receive a Lid, 5 1/8 inch Base and air cleaner element. If you have changed your carburetor to a 5 1/8 inch this is the air cleaner assembly for you.  Please measure you carburetor before ordering