I bought one from Randy two years ago and installed it. You will need to drill a few holes in the bottom of the valance. Before I mounted mine, I went to Lowe's and bought a small roll of black weatherstripping foam insulation, 1/8" by 3/4" wide with sticky tape on one side. I stuck the insulation foam to the lip of the spoiler before it went on so it would not have metal to metal contact when snugged into place with the bolts.