65 valiant door window gromet

Part KQ-RG at the bottom of this page is what you need. It goes into a hole in a metal bracket on the regulator and then the pin goes in the middle and pushes the tabs out.

MOPAR PARTS - DODGE MOPAR PLYMOUTH GLASS PARTS
This one goes into a round hole in the glass and a pin on one of the regulator arms goes through it to raise and lower the glass.