Sam, I think the GW's used Taylor Made back before they were bought out or whatever happened to them. I looked locally (and beyond) a few yrs ago without much luck. I know a Central-NJ guy that can cut flat laminated glass to size. I will dig up his info if you need. It's not as nice as the tempered glass in my opinion, but tempered is hard to find and is made to size specifically.
The frame extrusion is easier to find, I think Marine Glass Specialties has it and they may have the original specs for your boat. I tried there too and I wish I could say I found what I needed but give them a try anyway.
Marine Glass SpecialtiesMany times there is a rubber extrusion that fits into the frame and locks the glass in place. Hopefully you can re-use yours or I have seen the glass siliconed into the frame in a pinch...
You would think a "boat junkyard" would be teeming with this kind of stuff but surprisingly, no.
Good luck and I'd be interested to hear what you find.