Make sure the surface is clean before installation. Once used, we can not take it back for resale. We can upgrade the material to be the 304 stainless steel which will have the resistance to the salt in winter time.The item "2007-2013 GMC Sierra Crew Cab 6.8' Short Bed Rocker Panel Body Side Trim 6 14Pc" is in sale since Monday, September 9, 2013. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Exterior\Mouldings & Trim". The seller is "g-autoparts" and is located in Pomona, California. This item can be shipped worldwide.