Bilstein 5125 Series - Universal Fit Shocks. It is recommended that you replace shocks in pairs (both front shocks, or both rear shocks). The 5125 Series of Bilstein Shock Absorbers features a single tube filled with high pressure gas for a longer lasting and better performing suspension. The product benefits at a glance: Monotube gas pressure construction Self-Adjusting Deflecting Disc Valving High-Flow Piston Reduces Harshness Independent Rebound and Compression Tuning Larger Working Piston Area for Exact Damping Superior Control for Large Diameter Tires Available by travel lengths for custom applications Download the product catalog PDF Monotube Technology - the Number-One Choice in Motorsports The original and best mono-tube gas pressure shock absorbers all wear the Bilstein name, because Bilstein shock absorbers are the best there is. The number-one choice in motor-sports and for series-production sports cars, the monotube shock absorber has a unique design that affords the freedom to choose the ideal installation position or location. Monotube shocks feature a large surface on the working piston which increases the damping power and provides better handling. The design of the monotube shock improves the dissipation of heat which improves the life of the shock and enables a consistent and dependable level of absorber performance. Bilstein's Upside-Down Technology creates a safer functioning shock absorber. Gas Pressure Technology - Full Damping Power Under Extreme Stress Bilstein's gas pressure technology has become an established standard in the automotive industry. By employing a chamber of high pressure gas to keep the oil in the absorber under pressure, Bilstein's Gas Pressure Technology prevents the shock from becoming over-heated. Over-heating can cause the oil within the shock to begin foaming. Because this technology prevents over-heating, Bilstein shock 2 Year / 200,000 mile warranty.