Arnott's Coil Spring Conversion Kit C-4029 for the 2015-2017 Lincoln Navigator (U326) and the Ford Expedition (U324) with CCD delivers a seamless, error free conversion of your Lincoln or Ford adaptive suspension system to steel coil springs. The Arnott kit features strut assemblies with coil springs made from American steel. The US designed and assembled kit also includes Arnott's patented (US Pat. No. 9,329,917) Electronic Bypass Module (EBM) to turn of dashboard suspension warning lights.