The little tiny white bushings you need are one of the most obscure parts in the Mustang world. I have only seen one car with those still intact, an unrestored 65 Shelby that Bob Perkins had at the Spfld Illinois MCA National a few years ago. Owned at that time by a fellow whose last name was Stein I think. Those little bushings are going to be very difficult to find. I have somewhere an image of them, and have provided it to a couple of people in the past as they expressed an interest in reproducing the part but so far no results. Good luck on your search, I have been searching for one since 1986 with no luck. They must have been destroyed about the second time the trunk was opened.