This. All we gotta say is, this. You wanna be a real tuff guy? You need this. Drilled Holey Air Cleaner, washable foam filter element, and mounting hardware. The Air Cleaner measures 5 3/4" round and 2 3/4" thick and fits Bendix / Zenith and Keihin carburetors, not CV. (Although you may or may not be able to make it work, but you can't return it after drilling a bunch of holes in it.) You feeling lucky?