The Bilstein B6 (HD) Series 33-176857 is a high-performance monotube gas pressure shock absorber designed specifically for the rear axle of Ford E-Series vans. Engineered to improve handling, stability, and control under heavy loads without sacrificing ride comfort. Key features: Monotube gas pressure technology for instant response, high-pressure nitrogen gas for consistent performance, and heavy-duty construction for durability. Part Number: 33-176857 (Single Shock). If purchased as a set, common configurations include: 2x 33-176857 (Rear Pair) or 2x 33-176840 + 2x 33-176857 (Complete Front & Rear B6 Shock Kit).