Hi Dansken, welcome. Don't worry, most of us are pretty nice here, not so much in other areas of the site... I gather the road forum can be pretty snarky.

Then you should probably be asking in Classic & Vintage - they're nice guys in there, too. Someone might even be able to do you a replacement from their parts bin.

As for what fits, pretty much any old FD should work; compatibility in the friction era was near universal, and I'm a monkey's uncle if it isn't a 28.6mm clamp.