Genuine OEM Audi Timing Chain Tensioner Guide Rail, part number 07K109510C. This component is an integral part of the timing chain system, guiding the chain and working in conjunction with the tensioner to maintain optimal chain tension. Positioned in the upper timing assembly, it ensures precise valve timing and smooth engine operation. Made from durable, low-friction polymer, it measures approximately 0.19 meters in length. Using a genuine OEM guide rail ensures exact fitment and material quality, critical for the longevity and reliability of the engine's timing system.