Complete conversion kit transforms air suspension to reliable coil springs. Arnott's Coil Spring Conversion Kit for your vehicle (CD433) with CCD and your vehicle (CD391) delivers a seamless, error free conversion of your vehicle 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 (.