Used bolt for installing the door glass window run on any 1969-70 Mercury Cougar or Ford Mustang. This is the lower bolt that goes into the bottom of the door. 1/4-20 threads, hex head but a shallow hex head, Originally installed with a rubber seal, which is not included. 7/16" hex head, these had a Ford part number of 379513-S100. 2 needed per door, 4 per car, sold individually.