I think there are several options you could take. Contact your dealer and have them order you a window or go direct to FR and order yourself. Check the RV salvage yards you may find a complete replacement there or check with a local glass company for replacement.
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho