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".Some bikes have plated cylinders but the CB450 does not.
As for rings check the dealer and accessory shops, internet searches, etc. I'm sure you can accomplish that yourself. That's what the rest of us do.