GenRight Upper Control Arm Mount RSM-4020 Fits Currie Rock Jock 60;Rear axle;Heavy Duty 1/4 thick laser cut and CNC bent material;This part is designed to work with triangulated 4 link suspensions;Joint mount is made 2-5/8 wide and for a 9/16 bolt;Puzzled pieces are un-welded, this kit requires welding to properly install it on your axle bridge GenRight GenRight Upper Control Arm Mount - RSM-4020 RSM-4020 Control Arm Mount