This part is listed by BMW as BMW part number 12317515319 (12-31-7-515-319) and is described as BMW Voltage Regulator for Bosch 120A Alternator E60 525i/530i (2003-2004) and E85 Z4 2.5i/3.0i (2003, 2004, 2005, 2006).
Only For E60 5-Series and E85 Z4 With M54 EngineFor full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.
BMW Fitments:
5 Series
E60 / E61 (04-10) > 525i M54 (2004-2005)
E60 / E61 (04-10) > 530i M54 (2004-2005)
Z Series
E85 / E86 Z4 (03-08) > Z4 2.5i M54
E85 / E86 Z4 (03-08) > Z4 3.0i M54