Installed the GM splash guards today and I did it without instructions, lol. It took me a few minutes to figure everything out, but the installation wasn't very hard. The kit does come with 3/16" rivets, so you will need a rivet tool. I used Astro Pneumatic part number 1422 which worked great. It would be possible to use screws where the rivets go, but the rivets do look nice and secure the flaps pretty good. You also need to drill some 1/8" holes into the plastic wheel wells and 3/16" holes for the rivets that attach to the plastic trim under the front fender. I'm happy with how it turned and they do fit perfect. I used GM part number 42776252 on my AWD RS. I'll get some pictures posted as soon as I get her all cleaned up.