I am finalizing a deal on a 1988 R100RT, but I'm not sure how many different keys originally came with this model. The previous owner has a ring with several different keys on it but the only one that will turn is the ignition key. I can't get any other locks (seat, fork, glove boxes, or gas cap) to work. Fortunately, none of these are locked so I can still operate the bike but I don't know how many different keys originally came with the bike. There is no owners manual with the bike either. I don't know if I have the wrong keys, or if these other locks are gummed up or worse. Any help?