Hi, I have a 02 GT and installed a roush tool kit. Mine came with rubber exspansion inserts that you installed in holes in the trunk lid. Two of the four holes where already in the trunk lid, the other two I had to drill.I installed the box temporarily with the two holes that where already there, I then marked the holes that needed to be drilled with a sharpie.That made it easier to make sure the two holes I needed to drill would be exactly where they needed to be.I then un-installed the box and drilled the holes, inserted the expansion nuts and re-installed the box. I don't remember the size of the drill bit I used, just measure the holes that are already there. Hope this helps, good luck.