Bilstein M 9200 (Coilover) is designed specifically for professional off - road competition use which requires custom lengths and valve settings. M 9200 (Coilover) features a fully adjustable dual rate spring hardware system that will compliment a wide array of industry standard coilover springs. These coilovers are equipped with a 60mm ID remote reservoir and are owner rebuildable and revalvable. M 9200 (Coilover) offers the ability to efficiently adjust spring rates to achieve the optimum performance.