Is the generator the same diameter end to end, or does it step down smaller near the brushes? Either way, that alloy end frame can be welded by someone who is good with a TIG machine. It's a bit tricky to weld, but I've seen it done several times. There's also a non-welding repair method, so don't discard the pieces. I might have the right end frame stashed away amongst the piles of parts in my storage shed. Drop me a PM and let's talk!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!