Looking for cover for breaker box. Install dated 1978. It's a dinosaur I know, but wondering if there is a supplier with antique parts, or a boneyard.
Zinsco MTMB10 12-24
I never would have guessed there was that much of a demand for them, but it looks like this guy has actually made a business, or at least is trying to, out of finding and selling old Zinsco parts. Maybe you could give him a call. If he doesn’t know where to find one, then probably no one does. Zinsco Parts