you can get new glass for that car, i am pretty sure. here is a link, https://www.autocityclassic.com/package-2-piece-2indshield-vent-door-window-quarter-back-rear-glass-41-42-46-48-gm , that say they have any glass you need for that car and there are more.
I was going to mention a guy down this way also but when i seen where he lived i through in the other link. This computer stuff changed that world as long as it's not curved. Good luck bud and the window mechanism should be able to find but maybe not as easy, sort of thing.