Removing Windows from Doors

It is possible to lift the vent windows couple inches, separate the top of its frame and change out the forward glass guide parts. I wont recommend this procedure for if the car door should close while the vent window assembly is out of position ( lifted ) serious damage can result.

The forward glass guide kit contains the U shaped felt covered plastic channel covering the glass edge and 4 nylon guides.
Year One offers nice reproductions.
There is a plastic fastener through the glass at regulator.
It is old/brittle and often break. I've had better luck pushing the center pin on through. That fastener has recently been reproduced . Hope this helps.