Plug style seat mount. Designed to help mount the new Loveseat as low as possible to the frame. Will work with other types of seats. 3/16” nickel plated or parkerized.Comes with o rings to fit tight to a stock ID Panhead or knucklehead rigid frame seat post bushing but you may need to add extras if your bushing is worn or missing. Will not work with viper seat without modification.

Seat post bushings also available 

The Plug by Butts