Genuine OEM Audi Coil Spring, part number 1K0511115ER. This essential suspension component supports the vehicle's weight and absorbs road shocks, contributing significantly to ride comfort and handling stability. Designed for the rear suspension, this coil spring measures approximately 0.33 meters in height and weighs about 2.57 kg. Using a genuine OEM coil spring ensures the correct spring rate, precise dimensions, and durable material, which are critical for maintaining the vehicle's intended ride height, handling characteristics, and overall safety.