Second, I bought my backrest sans mounting hardware off Ebay for $140. I was going to just fab something up, bud said screw it and bought the 2 point docking hardware off Zanotti's.
Try Denniskirk.com, I have been looking at getting one from them. I think they are made by Mustang. It is the two piece system like HD sells. Around $210.
Just changed my bike (09 Road King) from detachable passenger backrest/luggage rack to Tour-pak. I sold the sissy bar w/pad and luggage rack on Craigs list almost right away. They didn't last the day! Deals are out there to be had.
if often swap between the tallboy HD seat and stock 2011 SG seat.. if i put a backrest on.. will i have to also keep moving the mounts for each seat i select ? im really thinking about getting a backrest for the long rides.