Genuine OEM Audi Rear Coil Spring Insulator, part number 1EA512149. This component is designed to be positioned above the coil spring in the rear suspension assembly, providing crucial isolation between the spring and other chassis components. Its primary function is to reduce noise, absorb vibrations, and prevent metal-on-metal contact, thereby enhancing ride comfort and extending component life. Weighing approximately 0.12 kg, it measures about 117mm in diameter. Using a genuine OEM insulator ensures the correct material composition and precise dimensions for optimal cushioning and durability within the suspension system.