Genuine OEM Volkswagen Alternator Deflection Roller, part number 03D145276E. This essential component is part of the accessory drive system, where it guides and supports the serpentine belt, ensuring proper alignment and tension for the alternator and other engine accessories. Its robust metal construction is designed to withstand continuous rotation and varying loads. Weighing approximately 0.35 kg, it provides stable belt operation. Choosing a genuine OEM deflection roller guarantees precise dimensions, durable bearings, and optimal belt alignment, which are crucial for preventing premature belt wear and ensuring reliable accessory function.