Front Truss Rock Krawler Upper Control Arm Mount Passenger Side Jeep XJ/TJ/LJ/ZJ TNT Customs. Front truss upper control arm mount designed for Rock Krawler brand suspensions. This passengers side mount is designed to only work with the Rock Krawler brand 3 link suspension. This truss upper control arm mount comes attached to your truss when ordered with the truss. Made of 3/16th steel, this mount gives you added strength for your upper control arm to mount to the front truss. Bushings and sleeve are not included with the mount.