BMW 11-28-7-582-946 - Mechanical Belt Tensioner 112811 Genuine Oem:Yes, Category 2:Engine Service, Fitment Footnotes:Vendor, Quantity Needed:1 Brand:BMW, Fitment Type:Direct Replacement, Item Name:Serpentine Tensioner, Category 1:Maintenance & Lubrication Manufacturer Part Number:11287582946, Category 3:Belts & Pulleys, Part Ref# On Diagram:ONLY PART REFERENCE #2 ON THE DIAGRAM IS