The Bilstein B3 OE Replacement 00-06 BMW X5 Rear Left Air Suspension Spring is a direct replacement for the original air suspension spring in the 00-06 BMW X5. It is designed to provide the same ride quality as the original spring with improved durability and longevity. The spring is made from high-grade steel for maximum strength and corrosion resistance. It is also designed to provide a smoother ride over bumps and other road irregularities. This air suspension spring is a great choice for anyone looking to replace their worn out or damaged air suspension spring.