That bag will fit the 1100/ 1150 RT, RS, GS, 1100S S, and maybe the 1200KRS. There are no serial #'s on BMW tumblers so tracking that way is impossible. Someone mentioned that maybe it's off a bike that was headed to Sedalia.......probably spot on. The ad on the MOA site will probably be your best bet. Or, you could just hang out on interstate 70 waiting to see if they happen to pass by on the return trip. Should be easy to spot.