I don't want to go against the advice of another very experienced moderator, but you really don't have to worry about those holes. I assume your talking about the rivets that use to put in the old black mats. On my 97 GTX, I pull up that old crap, popping out the rivets, took a hard paper, laid it down on the hull where you see the non-skid looking stuff, (or you can use the old ones if you didn't tear them up taking them out), and after drawing them on paper, I bought this 1/8" think, sanded on one side (it was 4x8, I think they use under sub flooring), laid out my paper, and bought a sheet of hydro-turf and made my own. I did a bit of custom too, where they wrap around the back. As for all those holes, I got a tube of pure silicone, then put a dab in each hole, smoothed it out with my finger. The good thing about using it is, it's pliable. If you use something that hardens up, it'll only pop out. If you aren't using the turf with the glue backside, I'd recommend using the 3M-99 adhesive. Mine has been on for over 8 years, and have only had to make minor repairs, in the foot area where it holds water. Good luck!