surreal- Many of my replies here are not so much for the OPs but for the others reading and trying to learn about their bikes. I agree that the likelihood of cantis and disk mounts is slim, but after 40 years of wrenching i have seen more then a few combos that one would never expect to see. Our local bike recycling efforts have produced some real strange combos. I've also had customers come in with their at home self done attempts to fix bikes using their old bike as a donor. I did agree that if the OP's set up is miss matched then their LBS needs to BOTH explain why (this is so the LBS learns not to do this again) and then make right. Andy.