Tough one. I've recently "restored"/refurbished a few old glass casting rods, and built a couple more. Vintage style guides I did not find, esp Carboloy, on the rod building sites. Luckily I only needed to replace one guide, and luckily again I had one in my rod building stuff. The others I simply buffed the inner ring, leaving the existing "patina"/corrosion. Kinda liked the look for those particular rods. For the new builds I ended up using SS304 guides and a ceramic tip.
Best bet may be hitting old tackle shows, flea markets, and thrift stores for old glass rods. They can be darn cheap since few people want them. I picked up a 5ft solid glass Actionrod for 97cents and just buffed out the existing guides. Guide quality though on many old glass rods may not be what you are after.
My 97cent Actionrod:
Buffed out rings and original "patina":
![](https://images.orcaonline.org/u/24307/medium/IMG_7958%20Large%20copy.jpeg)