Radius Arms are simple and they work! This bracket will allow you to mount a heim joint where the upper control arm on a radius arm suspension mounts to the lower arm. Having a heim joint in this location is critical to eliminating the inherent binding issues of a radius arm. The brackets are made to weld onto a lower control arm with a 2 inch outer diameter, and give you a 2 5/8 inch inside mounting width with a 9/16 bolt hole. These are made from 1/4 steel, sold in pairs, and welding is required.