This air cleaner adapter plate will adapt any CV style 3-bolt air cleaner to a 42 or 45mm Mikuni carburetor on an HD Evo or Twin Cam engine.
**A carb support bracket is 100% needed to sandwich the adapter onto the carb, there is no provision to clamp the adapter to the carb, the o-ring creates the seal and the support bracket keeps it in place.
Clear disclosure - this is a V-Twin part made in Taiwan, I'm not a fan of selling import parts but I offer a few based on customer requests and to hopefully cut down on shipping costs for people.