I just harvested a pile of them from a 74 f-250, all the trucks of those years use these clips, and are easy to find in the salvage yards (at least around me they are) truck frames are not boxed so you can get to both sides of the clip. tap the plastic center pin out from the back side with a small punch, when it is about half way out, the clip will easily come out with center pin still partially in it. One truck will supply more than enough clips for a bronco.