Why would we assume anything? Not that your attitude, username, and response to free advice don't invite all sorts of assumptions... still, I have no desire to make an ass out of me and you seem to be doing a fine job making an ass out of you.Do you really think I didn't check with the dealer, and or the accessory shops? $61 for three rings is a bit much. As for what the rest of you do well.... (put choice words here). The info on the cylinders was helpful though from "sarnali2".