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Front Air Suspension Spring OE 7L6616403B 7L6616404B for Audi Q7 Specification Suitable For: Audi Q7 Touarge Porsche Position: Front Original part number: (L)7L6616403B (R)7L6616404B Air Spring An air spring is a rubber and fabric bladder that holds air pressure to support a load and isolate passengers and cargo from the shock of motion caused by road irregularities. As the air pressure increases, the air spring can support more load while the spring rate increases. The