I have both the 3M kit and the eBay one. The eBay piece is not on the my Xfire, I bought it as back up in case I had trouble installing the 3M one. The eBay unit is much larger then the 3M piece and a bit thinner. It covers much more of the hood - probably a good 1/3 or more of it. The 3M I purchased is only 10" or 12" back from the edge. The eBay bra does NOT have the cutouts for the ribs, which can make "sealing" the piece a bit more labor intensive. The 3M one had the cutouts which also added its own misery to the install (there are 3M non-cutout bra's available too). Those cutouts in the Vinyl make "flaps" that are a mess to remove from the backing. It took some time, but it turned out pretty good for a self-install. There where some bubbles left, but they disappeared in a few days. So far so good, I've noticed no stone damage at all in the past few months. Mucho patience required for do it yourselfers.