Bought a front and rear wheel kit for my 2008 Chevy Avalanche. The front ones fit easily with the existing factory bolts and holes (plus the 2 extras that came with the valves). But there were problems at the back. They didn't match the contour of the Avalanche's rear fender, so I had to change the third bottom screw hole to align the guard with it. If you look at the photos you can see what I'm talking about by looking at the back of the flap. That issue aside, they worked great and I'm very happy with them. Just note that some modifications may be necessary.