I have a 65 chevelle 2 dr coupe the glass in the doors are not
staying in the track up at the vent window support i have put in the new seal there and along the door felt but the window keeps falling out of the track the car came with no seals and the panels r off so i can adj the regulators but it seams i am missing some parts inside the door

i noticed ther is 2 tracks inside the door the long one for the vent support which has a sloted screw for adj angle as it goes up and down and the other track is at the other side of the glass when the window is down
when the window is up it does not stay in the vent track i do not have a
manual or another door to look at to see if i am missing some other support bracket does anyone know how to adj this or have a manual
for these parts
thanks

A "Body by Fisher" manual shows your window parts and adjustments in great detail. They are about $30.00 but worth ten times more with the information you get out of them. To me it sounds like you are missing the rear vertical guide or the blade that rides in it and attaches to the horizontal window guide toward the rear. Without that your window is free to fall away from the vent window guide.

I dont have a manual but was able to search online and found a great
site that had a 66 chevelle body manual and found a detailed dwg of the
window parts and u were right it is called a rear window guide now i just need to find a place that sells one thanks for your help

p.s. the site was called oldcarmanualproject.com