Refined Cycle LR2-Skull Luggage Rack for Removable Passenger Back Rests in Corbin Seats This is a Patent Pending Luggage Rack that quickly and easily mounts to Corbin brand back rests or any other brand that uses a 5/8" square post or 1 1/4" or 1 1/2" wide backrests such as on some Harley Davidson or Victory seats. There are no brackets coming up from the fender struts to clutter up the clean look of your bike! Luggage Rack is made of 3/16 thick steel. Skull measures approx. 8" W x 10.5" L Installation is so quick and so easy we have a patent pending on the design! Just pull the 5/8" post back rest out of the seat and insert the post into the luggage rack mounting stem and back into the seat. Tighten a couple set screws and adjust the level! It literally takes less than 1 minute to put this on and take it off. The screw at the bottom allows you to adjust the angle of the luggage rack to level it for different seat post angles If your Removable Passenger Back Rest looks like the ones shown in the last picture, you should be able to use this luggage rack.