Genuine OEM Audi Rear Shock Absorber Stop Buffer, part number 8W0512131R. This essential suspension component is positioned within the rear shock absorber assembly. Its primary function is to limit the maximum compression travel of the shock absorber, preventing metal-to-metal contact and protecting the suspension from damage during severe impacts or large load transfers. Made from durable, resilient material, it absorbs excess energy and contributes to a smoother ride by preventing harsh bottoming out. Using genuine OEM stop buffers ensures the correct material composition and progressive damping characteristics, which are vital for suspension longevity and ride quality.