I found a multi-pack of the sheet metal speed nuts at local auto parts store and it had the right size to bite the studs. And I drilled out the holes that take the screws so the factory screws would actually fit them, then I used wax on the screw threads so they went in easier. If you notice, the holes in the plastic studs are actually slightly different sizes, so you will never get all the screws in without problems. Thats why I drilled them all to the same size. It doesn't take a lot of thread bite to hold the panels. Good luck!!