This Aux Belt Tensioner is designed for vehicles requiring a part with Brand: INA and Part Number: 531 0783 10. The tensioner has a width of 26 mm and a diameter of 70 mm, and it is a Tensioner Pulley for v-ribbed belts. It is compatible with BMW OEM references 11287786881 and 11287807021. This part is also listed under cross-references from various manufacturers including AUTEX, BREDA LORETT, CONTINENTAL CTAM, DAYCO, FEBI BILSTEIN, GATES, HUTCHINSON, OPTIMAL, RUVILLE, SCHAEFFLER GRUPPE, SKF, SNR, TRIPLE FIVE, TRUCKTEC AUTOMOTIVE, and VAICO. Please use the make and model tool to ensure compatibility with your specific vehicle. If you are unsure about fitment, please contact us for assistance.