Bilstein B4 OE Replacement (DampMatic) gas pressure shock absorbers and struts are self-adjusting dampers designed to replace the original units found on certain Mercedes-Benz models. Bilstein B4 OE Replacement (DampMatic) gas pressure shocks and struts are specifically engineered to be the best choice for maintaining the original ride quality of your vehicle, while meeting or exceeding OE standards. These dampers are the ideal choice for the driver looking to restore the original performance and handling of their vehicle, with the added benefit of world-famous Bilstein quality.