Today on this 2013 GMC Sierra, we're going to install part number HL97121 from Husky Liners. This is the Husky Liners Quad Caps Truck Bed Rail Protectors with Removable Stake Pocket Covers. Now to install these, it's very easy. First off we're going to make sure the truck is completely clean where our caps are going to lie on the bed. Then we'll go ahead and do a test fit with our caps. We'll… see more >