Funny you should mention that, I was just getting ready to list some vintage Guild parts for sale!
I have a '90's Guild Bigsby that I would sell, along with a '90's Guild Bigsby bridge top.
The bridge top has not been cut for string placement, is compensated (intonated) for a plain G string (that means you can play regular electric .010s in relative tune!), and has the wide 3" spacing from bridge post to post. It's the same one they sell on eBay for $19.95 under the headig:
'GENUINE GUILD SPECIAL ARCHTOP BIGSBY 0271 WIDE BRIDGE SADDLE 006-2918-000' I think it has a 12" radius on the bridge top, but I'm not sure.
I do know the ones from the '60's had an 8" radius (my luthier and I measured one with the correct tools!).
I haven't looked at the recent FMIC Guild Bigsbys, so I don't know if they have the same specs as the '90's ones. I don't even know if they were built in the USA or made under license. Somebody should know, though.
I haven't decided what to price to put on my '90's Bigsby yet, but Private Message me if you want and we can figure it out. Since you're new here, the way to PM somebody is click on their name and a small menu will come up: find latest posts, send private message, etc. Click on private message and send me your email address and I'll get back to you with pics, etc.
Welcome to the forum, gilded