Feature:1. Replacement for 335d 20092011, replacement for Alpina B7 20072008, replacement for 745Li 20052005.2. Reference part number: 11287520177, with professional manufacturing, high precision, strong reliability.3. Using synthetic rubber material, which allows it to maintain a constant tension on the drive system throughout the life of the belt, so no tensing mechanism is required in the system.4. Unlike ordinary multiV belts, this one has an elastic polyester tension element. The belt is installed under load and automatically maintains tension.5. Due to the original factory standard, directly replace the old or damaged one.Specification:Item Type: AC Compressor BeltMaterial: Synthetic RubberColor: BlackOEM: 11287520177Fitment:Replacement for 335d 2009-2011 Replacement for 545i 2004-2005 Replacement for 550i 2006-2010 Replacement for 645Ci 2004-2005 Replacement for 650i 2006-2010 Replacement for 745i 2003-2004 Note: From October 2003Replacement for 745i 2005-2005 Replacement for 745Li 2003-2004 Note: From October 2003Replacement for 745Li 2005-2005 Replacement for 750i 2006-2008 Replacement for 750Li 2006-2008 Replacement for Alpina B7 2007-2008 .Package List:1 xAC Compressor BeltNote:1. Please double check the part number of your item, matching information is for reference only.2. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!