I got both the rubber gasket and glass from Jim Carter, and as far as I can tell it fits as original both inside and out. Although it's been years since there was any glass or rubber on the truck, so I'm just going by how it looks compared to the edges of the frame.
I don't think my problems had to do with the materials, more with my lack of expertise.
Now that I know how to do it I will never do it again. The only reason I did this was because the local glass shop wanted $300, and wouldn't guaranty that they wouldn't break the glass during installation, nor that it wouldn't leak afterwards.
I'll get some photos to post today.
Tim
I am currently digging back in to a 1953 3800 (one ton) with a nine foot bed. I've owned it since 1979, and drove it until 1982 (or so). My wife got me involved in restoring it back in 2002, got the body removed and the frame redone, then things came up. Now I am retired and starting again. If anyone is interested I have photos on Imagur (
https://timwhiteblues.imgur.com/ ). I live way back in the woods in the Ozarks on 40 acres at the end of a 2 1/2 mile private road.
Tim