MCS, Mikuni HSR air filter adapter to CV for Harley Davidson

Aluminum.
It is mounted on the back plate of the air filter.
It is used to mount any air filter, with the Keihin CV carburetor mounting pattern (Constant Vacuum), in a Mikuni HSR 42, 45 or 48 carburetor.
Includes O -ring and assembly bolts.

Compatible with:> Mikuni Carburetors HSR42/45/48