Aside from an extensive internet search...
You could try this, the ads are in the old magazines of the day..I may be able to look, but not immediately.
Find the old address, often its a physical location. Then get a nearby member to check it out or try mailing letter to it. If its a long term landlord, he may know where the original place went next, or what the owner did next. They may have gone to greener pa$tures, could be dead, could be nearby..
But somewhere there may be boxes of spares or a fix.... Faint hope sort of deal.