Bilstein M 9200 (Coil Carrier) is designed specifically for professional off-road competition. M 9200 (Coil Carrier) utilize a fully adjustable dual rate spring hardware system that will compliment a wide array of industry standard 2.5 inch ID coilover springs. This coil carrier will not provide damping but will sustain the weight of the vehicle at the adjusted ride height. These coil carriers are sold by length and are for custom applications. M 9200 (Coil Carrier) offers the ability to efficiently adjust spring rates to achieve the optimum performance.