You need to remove the window frame. On the inside of the frame will be a sticker with dimensions and part number. Windows are/were made by Kinro which is now a part of Lippert. Once you have the info, including the coach vin, call Lippert Customer Service.
Vaughan & Tracy 2013 RW 36RL, 2013 F350 DRW CC, 2016 Focus. MorRyde IS, MorRyde pinbox, disc brakes, Comfort Ride Hitch. "Life is to be embraced, Grab it with both arms ! "