Genuine OEM Volkswagen Retaining Ring, part number 0B4311327B. This component serves as a critical fastener within the transmission assembly, securing internal gears and bearings in their designated positions. It is located as indicated in the transmission exploded-view diagram. Genuine OEM retaining rings are manufactured to exact metallurgical specifications and spring-tension tolerances, ensuring they maintain their shape and holding force under the high-stress, high-temperature conditions of a transmission environment.