We designed this kit to make mounting the rear shocks a whole lot easier. The kit includes an upper shock bar that you can weld to the side of your step notches or frame rails. You also get upper and lower shock mounting tabs. Hardware and shocks not included. Since there are many different axle diameters we offer you the following sizes: 2.75", 3", 3.5", 4". If you need a size that's not listed we will gladly make it for you.