The original glass was more than likely made by "GUARDIAN", if so look on the bottom of the glass where the two (2) windshields come together, which are seperated by the rubber gasket. There is a # located within the glass, that's all they need to get the correct glass. How do I know this, I had to replace both windshields on my previous 1982 Fleetwood Pace Arrow several years ago. The glass company I used came to my home and installed them.
Good luck, happy trails & travel safe. BTW, the FIN is a small aluminum plate possibly to the left of driver seat about head high, or on the outside of the driver area.