Customs 1949 plymouth fastback rear glass or alternative

we haven't found rear window gl*** anywhere for our 1949 plymouth two door fastback. we are guessing its because its curved. has anyone used lexan or some thing similar to make a curved window. does the plexigl*** withstand heat and warping?

 

Plexi and Lexan are poor choices for auto windows. There are windows out there for your car. They're not that rare. Try early MoPar forums and clubs. Somebody has one

 

Shouldn't be that hard to find the real thing, try the http://p15-d24.com/ forum