Although everything in the product description says it will fit 2006 Silverado 1500, it does NOT fit or does not fit well. Later they can change the description and equipment, but at the moment it doesn't fit or the equipment is bad. The main problem comes in two parts: The installation instructions are wrong - I had to drill a different hole than the instructions and only one hole in the valve fit. The mounting around the expander itself was of poor quality - there was over 1/8 inch clearance between the valve and the truck. Due to inaccurate instructions and poor fit, the sign is not parallel to the tire tread and the sign on the back seems a little crooked. All packaging documents, part numbers and instructions indicated that these were supposed to be the correct flaps for the truck. In this case, they need to seriously refine their design. The only reason I gave it 2 stars is because the fender construction feels very solid and high quality.