I bought a set of side and front utilitrac rails (thanks to junglejim) I was eyeballing them up to my bed. I have the the holes in front and back of sides with bolts already there to mount. However in the center of the sides there are 4 bolts that are supposed to go into the holes to hold rails in place and I don't have those holes. I can always drill the holes or run metal screws directly into bedside. I was wondering if there was anything auto related that acted as a drywall anchor does. That I could drill put the anchor in and run screw which will hold it in place? (Similiar to drywall anchor for hollow wall mounting) any thoughts. Looks like the trucks that have these from the factory already have a nut welded onto the bedside to accept the bolt...