Arnott's new BMW suspension product line for the rear of the BMW X5 includes a new BMW X5 rear left air spring without sport suspension featuring a Continental ContiTech bladder engineered and assembled in the USA. Arnott backs the BMW air springs with a Limited Lifetime Warranty! The aftermarket BMW suspension kit comes complete with rear air spring and seal. It is recommended that you replace your BMW Air Springs in pairs - The right rear air spring is part number A-2501.