This is our Basic model of Coil Spring Axle End mounting, a simple platform with a 1 5/8" hole for a tube and Bumpstop location. However, we don't like anything that dosen't contribute to overall strength and this one does that. It is made of 3/8" A50 Plate so that is adds structural rigidity to the axle tube in its mounting area, after all, your suspension is pounding on this area all day long! These have a 7" diameter mounting surface and are cut for a 3" axle tube but can be modified quickly. These are sold in pairs.