Bad to worse....the inside collar is broken too....so now I have a busted engine case as well. I can't find the piece(s) either, I was thinking I might be able to weld the cover but it looks like cast aluminum - almost like pig iron, too thin. The gears and starter look fine, the inside of the engine case is worn a little but nothing serious.
So now what, a call to the local dealer who will no doubt tell me they've never heard of such a thing happening but will gladly repair it for $xxx. Looks like I now own an expensive sea anchor.