AIR CLEANER 2″X4″ FINNED 2 5/8 Base Vintage Speed Vintage Speed’s own 2″x4″-finned top classic air cleaner. The unique base design allows you to use the socket head set screw or attach with 1/4″-20 stud on carbs with drilled boss (Rochester 2gs etc.) Show polished cast aluminum with a modern frame element behind a plated screen and a three bar spinner nut. The classic look you want with the engine protection you need. This is the finest air cleaner you can buy for the money. Please specify 2 5/8 base or 2 5/16″ bases size.