HELP - Campag Rear Mech Problem

The hanger bolt (see pic)  for the rear derailleur on my Bob Jackson sheared off yesterday when nearly back from 11's at Morland! No idea why, but been somewhat clunky gear shifts recently. Bent the hnager bracket (part of the frame, not separate like today's bikes), but have straightened with a big adjustable spanner as leverage.

It's an old Campag Racing T / Racing Triple 9 speed mech (seems there were 5 variants) and spares are hard to find.

Slim chance, but if anyone has an old or broken Campag 9 or 10 speed rear mech languishing in a box, I may be able to raid it for spares.

Or suggestions where I could find one.

OK, could change the whole setup for Shimano and far better gear shifts, but that's how the bike came to me from Keith Jowett many years ago and be nice to keep it as was.