The XBR bags have slots for the mounting bracket to go into. The XBS bags just use a strap with velcro on it. They appear to be the same but once you see them both in person you'll see the difference. In the picture look at the area where the "B" is. The mounting bracket slides into that and holds the bags from moving around on the bottom side. If you actually have these bags that use this type of mounting bracket, you're probably going to have to fab one up like xtremelow said. It wouldn't be hard at all. I bought the Lightning ones and they work fine with using the zipties on the passenger peg heel guard and the license plate bracket. Good luck.