The BILSTEIN Air Spring Suspension (40-288871) is a professional-grade replacement component engineered for long service life and reliable operation across all conditions your vehicle encounters. The part is built to the following specification: for OE number: 37 12 6 765 602, for OE number: 6 765 602, Fitting Position: Rear Axle, Spring Design: 20. Each dimension is checked against the OEM reference to ensure the component seats and functions correctly first time. Verified to fit BMW models. All compatibility data is cross-checked against the TecDoc database — select your vehicle to confirm the part matches your specific engine and year. This part supersedes original equipment references: 37 12 6 765 602, 37 12 6 765 603, 6 765 602, 6 765 603. Matching these numbers confirms a like-for-like replacement with no loss of function. BILSTEIN is a recognised supplier of automotive suspension components to independent workshops and dealer networks across Europe. All parts are sourced from authorised distribution channels and carry full manufacturer traceability — you receive exactly the same component supplied to professional garages and dealer workshops. If fitment or specifications do not match your vehicle, our technical team can help identify the correct alternative — use the vehicle selector or contact us with your VIN for a guaranteed-fit recommendation. Replacing worn components on schedule preserves your vehicle's safety, reliability, and resale value — and aftermarket parts from established brands deliver OEM-equivalent performance at a fraction of the dealer price. Every part is dispatched with tracked delivery and a 14-day money-back guarantee with hassle-free returns.

BILSTEIN, founded in 1873 in Ennepetal, Germany, is a premium manufacturer of monotube shock absorbers and suspension components, part of thyssenkrupp. BILSTEIN specialises in high-performance gas-pressure shock absorbers, coilovers, lift kits, and electronic damping systems. As the OE suspension supplier to BMW, Mercedes-AMG, Porsche, and Ford Performance, BILSTEIN represents the highest tier of damping technology. From professional motorsport to luxury touring, BILSTEIN delivers superior handling, comfort, and durability that discerning drivers and performance enthusiasts demand.