Arnott's Coil Spring Conversion Kit C-4426 for the 2015-2020 GM SUV's (GMT K3XX) delivers a seamless, error free conversion of your GM SUV front and rear air 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.