rear engine cover

Hi there, I have a busted mechanical water seal and stupidly bored the hole for a new seal all the way through. I now need a new rear engine cover and wondered what fits or does it need to be the exact model? It's a 1981 deluxe. Or if anyone is selling one that would be a big help. Thanks...

So I bought a 1980 CX500C a couple months ago that was completely in pieces. The stator Source Coil Low Speed tested outside of range and the three yellow wires all had continuity to Ground. So I bit the bullet and bought a G8 stator from Custom Rewind and an Ignitech from Cobram's most recent...