I have replaced several of the vent windows and have never had to remove the side glass or the rear window track. I can usually snake it out by turning it 90*. 3 bolts through the outside door frame. the 1(or2) on the window track. There are also sometimes a bolt that goes through the door frame just under the the glass frame(sort of behind the mirror area) And i also will take the rod that goes to the bottom mirror bolt out. Remove the bolt for it from the inside, and I can usually get away with just doing that and swing the bracket out of the way without messing withe the mirror itself. Once the vent window is out, the main glass will be flopping around inside the dooe enough to beable to replace the seal that runs down the rear glass channel. lat truck took me 1/2 hr per side.