Can it be changed and how is it done?I searched old forums but no luck.

 

Yes. The rear seal has to be unzipped, then the window can be removed, and a different one put in. The trick is to figure out the type of eindow seal used, and correctly un do the seal. Some require a new seal for the new window, so the old one can just be cut. Hope this helps. Sounds much more complex than it generally is.