Hardware Kit-Standard - 20-21 CHV/GMC Silverado, Sierra HD Only. Note: Use with BackRack, Safety Rack, Louvered, Open, Half Louvered, Half Safety, Three Round, Three Light., BackRack Standard Hardware Installation Kit is designed to be used on trucks that will not have a cross bed toolbox behind the cab and is everything you need to install your BackRack Truck Rack. Features: Standard Hardware Kit is designed to be used on trucks that will not have a cross-bed toolbox behind the cab. This system consists of a rail mount bracket and rail plate that adds strength to the sheet metal bed rail of the truck. The rail plate provides a solid base on which to secure the cab guard assembly. Only this hardware kit is compatible with tonneau cover adapter brackets. Install instructions are kit-specific. 1-Year Warranty on workmanship; powder coat finishes not warrantied.