Description: It is connected to various engine drive components through a belt drive system and helps to ensure that these components receive power from the rotating crankshaft to perform important functions. This Belt Idler Pulley fits for BMW when using a short water pump. Please confirm your car model of the part before purchasing to avoid buying the wrong one. This is a non-OEM product, accessory only! Specification: Color: Black Material: Metal Center Hole Diameter: 17mm / 0.67'' Size: 2.8x8cm / 1.10''x3.15''(H*D) Thread Size: M10x1.5 OE Number: 1287556251 Fitment: for BMW 1 Series M 2011 for BMW 135i 2008-2011 for BMW 335i 2007-2013 for BMW 335i xDrive 2009-2013 for BMW 335is 2011-2013 for BMW 335xi 2007-2008 for BMW 535i 2008-2010 for BMW 535i GT 2010 for BMW 535i xDrive 2009-2010 for BMW 535xi 2008 for BMW Z4 2009-2016 Package Included:1 x Accessory Drive Belt Idler Pulley