Reviewed By Greg F (DAVISBURG, MI) Reviewed for a 2011 GMC Sierra —11/16/2014 12:29 PM
No drilling, as advertized. Front: all the holes lined right up. I used a rubber mallet to re-insert the plastic insert fasteners. Rear: 2011 Sierra has no existing holes, so the special clamps were included. They worked well, just make sure the clamp gets a bite on the metal fender, it is possible to screw it down tight without the clamp actually grabbing the truck. The flaps are a little narrower than the Z71 tires, but they miss on the inboard side only, so the paint is protected.