Each manufacturer used their own side glass and rear door glass. Usually the side glass is able to be obtained from similar coaches of similar years that are being broken up for parts. As a coach gets older, the harder it is to find glass for it, with the exception of the windshield. Rear door glass seems to be the hardest to find, since it was usually sourced from some other vehicle, but what that vehicle was, is seldom if ever known. I searched for 3 years to learn where the rear door glass came from for my 1963 Pinner Chrysler and only learned what it was a couple of months ago. I also learned that it is extremely rare car model, and was told that it would be next to impossible to find. Thanks to Ed Renstrom, I now have 2 spares, and hope that I will never need them.. Paul