I solved my problem this past weekend. For a $1.88, I bought a set of 4 plastic inserts that came with 8 screws at my local auto parts store. I spent about 45 minutes measuring, marking, drilling and cutting square holes in my bumper to accommodate the inserts. My license plate now fits very snug without the fear of losing it with the half-a$$ed method that was there (isn't it interesting how dollar signs look a lot like an S.....hmmm). And just for your information, there are no wires or anything else behind where the holes were drilled.