Glenn:
When I fixed all the creeping seals in my Beaver, I broke one of the pieces of glass. I went to a glass shop in Temecula as that was nearest the CG I was in at the time. They were able to cut a matching shaped piece of glass (luckily I broke the clear side, not the tinted side) and then send it out to be tempered. I installed the new piece and all is well. The installation is simple, requires no special tools, but does require the seal and the right kind of caulking, all of which I got from Dave Root in Bend Oregon(one of the creeping seal replacement guys).
Based on my experience, you should ask at a well equipped glass shop in your community and you should have no trouble finding one that can help you out.