When used on the lateral link these shims will center the axle with the frame rails. Also will adjust thrust angle and toe by placing the shim between the spring hanger and the spring. #36020 Thickness: 1/32" Qty: 6, #36021 Thickness: 1/16" Qty: 6,  #36022 Thickness: 1/8" Qty: 6. Note: Ordering one Part Number gives you six shims in a box.