This kit creates a full-size rack that sits above your Ford F-250-F-350’s (w/ReTrax XR rails) load bed. This Slimline II cargo carrying rack kit contains the Slimline II tray (1575mm x 1964mm) and 8 Pickup Truck Bed Universal Legs that fit into the existing ReTrax XR rails. All Front Runner Rack Kits contain installation instructions as well as all the components needed to mount the Slimline II Tray to your vehicle. All Front Runner Racks are backed by a Limited Lifetime Warranty* Note: If your Roll Top extrusion has a 6mm (0.24'') to 7mm (0.28'') slot opening, you may need RRAC962 for installation.