Jeep Front Truss Lower Control Arm High Clearance Small Tube Mounts Jeep XJ/TJ/LJ/ZJ TNT Customs. Jeep high clearance lower control arm mounts are just what is needed to get those control arms up out of the rocks. Because these mounts are located on the backside of the axle, not hanging down below the axle like factory, you must have adjustable control arms to use these. These mounts are welded to the axle after you have the truss in place on the axle. Mounts are for small tube axles, large tube available. CNC cut and precision formed out of 3/16th steel.