XRS Cross Bars 37 3/4 Inch Side Rail Accessory Kit Textured Black Go RhinoUpgrade your XRS Cross Bars with additional 4 CORE Side Rails that connect the uprights on both sides of your truck bed. The Side Rail Accessory Kit provides additional mounting tracks for a variety of gear and accessories. XRS Cross Bars come with a Limited Lifetime warranty on materials and construction and a 5 year warranty on the Textured Black Finish. Features and Benefits: 4 CORE is an extruded track system that works with any 1 4x20 hex bolt or