Do you have the one from the other side to use as a pattern? That's not a high tech part- - - -you can make one from a big flat washer by spending a little time with files and a grinding wheel. Getting the anti-rotate tab on the inside shaped correctly is the biggest challenge.
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!