It has been a long time, but I remembered there is a tab in the gasket/seal that the glass slides in on the wing window trim.

Step 7:
When you slide the door glass out of the vent wing assembly you see a plastic and felt slider seal on the front of the door glass. Most of the time this slider has deteriorated and must be replaced. Sliders are available through Chrysler and are reproduced. They are difficult to install correctly. Take your time.

Upon reassembly make sure the seal slides freely in the vent wing channel. You have to drill or punch out the holes for the pins to attach the slider. Using pliers squeeze the new plastic clips and pins through the hole in the glass and the slider. You have to trim the slider to length.

found here. https://www.mopardiy.com/mopar-b-body-miscellaneous-mechanicals-guide/

no pictures. But as I recall it is at the top and prevents it from pulling away. you should be albe to slide it all the way down and see where it is hanging up on the wing window gasket.