1964 Valiant "Get Runnin & Drivin"

The back glass should be tempered glass, where the front windshield was laminated safety glass. Usually, the tempered glass is a little more forgiving. Sometimes the work you gotta do to GET to where you can work, is worse than the job you're trying to accomplish! Maybe once you unzip the lock strip, and lay the lube to it, it will push out ok.