The MB3049 Rear Axle Upper Control Arm Mounts are designed to weld on top of a rear axle truss to provide a quick & easy solution for heavy duty mounting points for your custom rear suspension upper control arms. The upper control arm mounts are used when building a custom rear triangulated 4 link suspension. See the dimensional drawing for design details. The mounting hole diameter fits 5/8" bolts. You can drill the hole to a larger diameter to accept larger bolts for other sizes of joints. You set the distance & clearances for your inner mounting plates during your installation. This kit will fit joints measuring up to 2-5/8" wide. The kit includes three (1) precision laser cut & CNC formed 1/4" thick high strength main steel plate and two (2) flat 1/4” tabs. The kit ships unwelded & raw steel. Specifications Product Components