You can have automotive glass cut to just about any size and shape you need, while flat glass. Cut out a cardboard template, have glass cut to match.

Here two sites which carry a great variety of window molding:

Click On "Universal Parts"

Click On "Order Online"

Billyray


1948 GMC 3 Ton Flatbed
1952 Chevy 1/2 Ton Panel
1956 Chevy 3/4 Ton NAPCO