Adjusting Pulley. Not sure if this part fits?.
INA US Adjusting Pulley Assembly 5310267100 fits 2000-2003 BMW M5 / 1997-2003 BM
INA US Adjusting Pulley 5310162100 fits 1994-1995 BMW 530i / 1994-1995 BMW 540i
INA US Deflection Pulley 5320303100 fits 2002-2004 BMW 745i / 2002-2004 BMW 745L
INA US Deflection Pulley 5320553100 fits 2009-2011 BMW 335d
INA US Deflection Pulley 5320553100 fits 2009-2013 BMW X5
INA US Deflection Pulley 5320343100 fits 2004-2006 BMW 525i, 530i, X3
