Add-a-Leaves are sold in Kits, i.e., 2 leaves & required center bolts. Add-a-Leaves will generally lift your vehicle 1-1/2 to 2 inches depending on equipment and load and will stiffen your ride somewhat. Add-a-Leaves also have the benefit of giving your vehicle increased load carrying capacity. This is the least expensive way to lift your vehicle other than blocks. If you want a more engineered suspension, you may wish to consider a complete lift kit with front and rear springs.