If you like running with scrap parts exclusively, or as close to exclusively as possible (as I do), then you might consider how I mounted mine:
http://ecomodder.com/forum/showthrea...tml#post464528
I should warn that I expected this method to scratch the paint around the wheel well, but this was my third attachment method. All the others worked too, but I thought this was optimal in terms of durability, wheel clearance, and coverage--I I took the plunge and thought of it as a permanent mod. It has scratched the paint under the cover, not really badly, but yes... scratches in some places.