This is the driver side window regulator track lower window frame. It is original and comes off a 1959 Apache truck. I believe this will fit years 56-59 but may even work for more as these parts stayed the same for truck bodies. It is in excellent condition. This is the piece that connects the window glass frame to the roller that moves your window up and down.
You can't find these anymore. It is from a 65 year old truck.
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I'll take ad down when sold, so if the ad is up the item is still for sale.