TracRac 22500 Overhead Racks for Full Size Trucks Part 2 of TracRac System - Combines with a base rail part number to complete the TracRac standard system. For use on Fullsize Pickups Rugged, powdercoated aluminum construction won't rust or corrode! Overhead Racks slide on base rails allowing then to be repositioned or removed in seconds Includes two pairs of the Crossbar Tiedowns that can be repositioned anywhere along the crossbars