Interchange Part Numbers: 544 0501 20, 1018705, 544 0501 20--Schaeffler INA, 49107962--CORTECO, FVD1181--FAI AutoParts, 173069--FEBI BILSTEIN, V20-8715--VAICO. Manufacturer: Schaeffler INA. The engine usually has an idler and/or tensioning pulley as well as a few pulleys that use the power of a travelling serpentine belt to drive components such as the alternator or water pump.
