Arnott's Coil Spring Conversion Kit C-3426 for the 2013-2019 Cadillac XTS (Epsilon II) delivers a seamless, error free conversion of your Cadillac air suspension system to steel coil springs. The Arnott kit features shocks paired 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 off dashboard suspension warning lights.