I had these Viking bags on my Rocket III, There was really know way for me to mount them in the traditional sense, so I had to fabricate longer bolts, VERY large washers and hollow steel sleeved (for the bolts) to affix them to my rear fender side brace. I also had to reinforce the flap hinges with metal plate and screw rivets. It came out very well, better than the original construction.

I looked all over the web for bags to compliment my Rocket. Viking was the best to be found.