Philadelphia Luthier Supply is where I usually start my searches. You can go up in price and quality from there, but PLS is a decent starting point.
Also, this is a pretty cool corner of the forum. Someone may well pop up and offer you some goods. I was humbled by members' generosity when I brought home a '78 Custom that needed some goods to bring it to its proper self. A few members came through (free or next to nothing) with period correct parts.
I'll check my parts bin. I think the only period correct item I might have kicking around is a poker chip. Let me see what I've got in there.
Thanks all! Pretty cool story behind it. The guy I got it from had it since he was 13 years old. It has sat in the case for the last 20 years. Can't wait to get some new strings on her (no close stores open yesterday).
So, regarding plastic, I see that I can get most items that are Gibson branded. Should I go that route with regard to black plastic? Or is it the same stuff that PLS would have? Are the pickup rings "low" height? And, would a current bwbwb pickguard fit the '77, or should I hunt down one from a 70's model? How about the gold pickguard bracket itself? Sorry for all the questions... I just want to do the right thing for the guitar instead of half-assing it...