...... track inside the door. I have found the easiest way to put the piece back in the track is: 1.) remove the track. 2.)install the square piece on the pin in the window. 3.) Work the track back into the door and place the square piece back into the track. You will have to rase the window and lower it a few times in order to get it back together. 4.) then resecure the track ( One bolt at the top and one bolt at the bottom). Not a very hard job to do once you look at it. I have done the job before and it doesnt take but about 30 minutes to do.