Years ago he changed the carburetor, and of course the original wouldn't fit. So for the past twenty plus years, the air cleaner has been in his garage. So I'm prepared to buy it off him. Knowing it won't fit any Demon or the new AFB design carburetors. Is there any adapters available ? A machinist I know say's he can modify it to fit. I'd rather not infringe on the friendship. Any suggestion ?