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” thick (or the plug lite is 1/8") nickel plated, raw steel or now stainless.
Comes with o rings to fit tight to a stock ID Panhead or knucklehead rigid frame seat post bushing (1.2" ID) 
Seat post bushings also available