Replace worn rear lower control arm cross axis ball joints on the Lincoln LS and Ford Thunderbird with xAxis Sealed Flex Joints from SPC Performance. SPC's xAxis joints feature highly polished electro - less nickel balls, moly impregnated nylon races, anddust boots to keep contaminants out ensure long life. xAxis Joints come pre - greased and are designed to be maintenance free. This kit includes four (4) xAxis joints and two (2) press tool adapters to service a complete rear end. California Residents WARNING