Genuine OEM Audi Rear Coil Spring Underlay, part number 8E0512145. This underlay is designed to provide essential cushioning and support for the coil spring, reducing noise, vibration, and wear between the spring and its mounting surface. It is positioned at the rear of the vehicle, typically at the base of the coil spring. Weighing 0.054 kg and with a diameter of 0.09 m, it is made from a durable rubber or elastomer compound. Genuine OEM underlays ensure the correct material hardness and dimensions for optimal suspension performance and longevity.