Two options now available, Regular and Slim.
The regular version is best for flat bottom seats.
The new Slim Version is designed specifically to help mount the Lazyboy to a swing arm shovel frame. 
If your frame has a weld on hardtail get the regular plug option, not the Swinger plugs.
Plug style seat mount for stock swingarm Shovelhead frames. (Up to late 1978)
Designed to help mount your seat to your Swingarm Shovelhead frame without welding stuff on. Also helps get your seat as low as possible to the frame.
3/16” thick, nickel plated or raw.
Comes with o rings to fit tight to a stock ID Shovelhead frame seat post bushing but you may need to add extras if your bushing is worn or missing.
Seat post bushings also available.