There I are two rubbing blocks that mount just below the window fuzzy. These are not the stops. They tip the top of the glass in slightly for it to align in the weather strip u channel. I don’t recall any adjustment on these rubbing blocks. If these parts are worn window position in/out when rolled up won’t be right. If vertical tracks are adjusted too far towards the door skin they might act like stops. Front travel stop is at the bottom of the front track. Seems to me the rear is on the window bracket.