I am having a hard time finding a tonneau cover for my 97' Silverado. It is a short box stepside that has a Line-X spray in bedliner. Preferably, I want a soft roll up cover that has velcro and not snaps. Also there is no lip inside the box so a clamp-on mount would not work. Would I use self-tapping screws instead or are there other options? Any recommendations on where to look to buy a cover? I'd prefer to install it myself to save a couple of bucks. Thanks.