RAM Part RAM-B-309-7-C2 : Powder coated marine grade metal with a standard 1/4" - 20 threaded post.  Zinc coated U-bolt will fit handlebars up to 1.25 inch diameter.  Also included is the brake and clutch reservoir for Goldwing and HD owners.  There are two arms and a connector (1.75" arm and 3" arm).  Vibration dampening technology.  Lifetime manufacturer warranty.