Ford drilled holes in the trunk and fender ext. to install these pieces. You have to drill
holes in the car to put it on. I think there were four holes in the extensions and ten or
more in the trunk. If you do the work make sure you treat the holes with something to
keep rust from showing up. The fender ext. won't rust they are pot metal. The amount
of clips in the trim for the trunk will let you know how much drilling you will have to do.