since its not smoked in yet go to a head shop and size it up. Don't buy stems off the internet unless there's one you really want. Just too much risk involved. I can't think of a worse feeling than spending the money for the stem, money for the shipping, AND pick out the exact stem you want only to have it not work when it finally arrives. As far as your question goes though,...I take it that it is not glass on glass then, take some pictures and post them. Just too many variables.