1959-79 Ford Pickup, Window Roller Assembly – Front,- 3/4 OD X 1/2 Long,

The roller assembly attaches to the end of the window regulator arm. It’s the part that slides back and forth in the channel, allowing the window to glide up and down smoothly. If your window tilts forward or back, and isn’t level when you roll it up, a broken or damaged roller might be the cause.