Just like a Series truck.
Remove/grind out the little screws in the middle of the upper tracks, then the slider window and its track will slide to the inboard side and you can lift it out. Then undo all the screws and retainers to remove the fixed window.
A cut off wheel is usually the best too to remove the screws from the tracks if they are rusty, the heads usually strip or break.
I do not check PMs. Call or email if you need something.
ECR is not a parts source. We are not in the mail order business.