Genuine OEM Audi Rear Shock Absorber Helper Spring, part number 4M0512131E. This component works in conjunction with the main suspension spring to provide additional support for vehicle weight, particularly under varying load conditions, and to enhance ride comfort. It is installed as part of the rear shock absorber assembly. Weighing 0.0869 kg, this helper spring is engineered for durability and consistent performance. Choosing a genuine OEM helper spring ensures the correct spring rate and material quality, which are crucial for maintaining proper vehicle stance, handling, and suspension longevity.