Barnes 4WD Pro Series Rear Axle Truss Bump Pads can be used with hydraulic air bump stops or rubber and polyurethane bump stops. These are made specifically for our Pro Series rear trusses. The brackets are laser cut and CNC bent from 1/4" steel. They measure 4.5” x 5” sold individually. They are made in the U.S. from U.S. Steel!