I'm not sure what the part is called but it's bolted onto the inner back side of the door and it's a guide for the window when you roll it down.
It's part number 21508 on the broncocity.com link below, It's in the lower right side of the picture.
http://www.broncocity.com/66_77_techpages/6677_door.htm
It's part number 21508 on the broncocity.com link below, It's in the lower right side of the picture.
http://www.broncocity.com/66_77_techpages/6677_door.htm
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