When doing replacement or upgrading on 1989 – 2007 BMW 525i 525iT 525xi capsule halogen headlamps HID with, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight1989 – 1995 9006
High Beam Headlight1989 – 1995 9005
Front Fog Light1991 – 1994 9006
1989 – 1990, 1995 H1
Back Up Light1989 – 1995 1156
Brake1989 – 1995 1156
Front Side Marker1989 – 1995 12961
Front Turn Signal1989 – 1995 P21/5W
License Plate1989 – 1995 12844
Parking Light1989 – 1995 1157
Rear Turn Signal1989 – 1995 1156
Tail Light1989 – 1995 12814
Center High Mount Stop Light1989 – 1995 1156
Engine Compartment Light1989 – 1995 578
Glove Box1991 – 1995 DE3423
Trunk1989 – 1995 6411
Low Beam Headlight2001 – 2007 H7
High Beam Headlight2001 – 2007 H7
Front Fog Light2004 – 2007 9006
2001 – 2003 H8
Back Up Light2001 – 2003 1156
2004 – 2007 921
Brake2001 – 2007 1156
Dome Light2001 – 2005 578
Front Side Marker2004 – 2005 12961
Front Turn Signal2001 – 2003 3357NA
2004 – 2005 PY21W
License Plate2001 – 2003 12844
2004 – 2007 6418
Parking Light2006 – 2007 12961
2004 – 2005 194
2001 – 2003 H6W
Rear Turn Signal2006 – 2007 PY21W
Tail Light2004 – 2007 1156
Front Inner Turn Signal2006 – 2007 PY21W
Front Outer Turn Signal2006 – 2007 12396NA
Center High Mount Stop Light2001 – 2003 1156
Glove Box2001 – 2007 DE3423
Interior Door2006 – 2007 194
Stepwell2001 – 2007 12844
Trunk2001 – 2007 6411
Low Beam Headlight2006 – 2007 D1S
2001 – 2005 D2S
High Beam Headlight2001 – 2007 H7
Front Fog Light2004 – 2007 9006
2001 – 2003 H8
Back Up Light2001 – 2003 1156
2004 – 2007 921
Brake2001 – 2007 1156
Dome Light2001 – 2005 6411
Front Side Marker2004 – 2005 12961
Front Turn Signal2002 – 2003 3357NA
2001 3457NA
2004 – 2005 PY21W
License Plate2001 – 2003 12844
2004 – 2007 6418
Parking Light2004 – 2005 194
2001 – 2003 H6W
Rear Turn Signal2006 – 2007 PY21W
Tail Light2004 – 2007 1156
Front Inner Turn Signal2006 – 2007 PY21W
Front Outer Turn Signal2006 – 2007 12396NA
Center High Mount Stop Light2001 – 2003 1156
Glove Box2001 – 2007 DE3423
Interior Door2006 – 2007 194
Stepwell2001 – 2007 12844
Trunk2001 – 2007 6411
Low Beam Headlight1993 9006
High Beam Headlight1993 9005
Front Fog Light1993 9006
Back Up Light1993 1156
Brake1993 1156
Front Side Marker1993 12961
Front Turn Signal1993 P21/5W
License Plate1993 12844
Parking Light1993 1157
Rear Turn Signal1993 1156
Tail Light1993 12814
Center High Mount Stop Light1993 1156
Engine Compartment Light1993 578
Glove Box1993 DE3423
Trunk1993 6411
Low Beam Headlight2006 – 2007 H7
High Beam Headlight2006 – 2007 H7
Front Fog Light2006 – 2007 9006
Back Up Light2006 – 2007 921
Brake2006 – 2007 1156
License Plate2006 – 2007 6418
Parking Light2006 – 2007 12961
Rear Turn Signal2006 – 2007 PY21W
Tail Light2006 – 2007 1156
Front Inner Turn Signal2006 – 2007 PY21W
Front Outer Turn Signal2006 – 2007 12396NA
Glove Box2006 – 2007 DE3423
Interior Door2006 – 2007 194
Stepwell2006 – 2007 12844
Trunk2006 – 2007 6411
Low Beam Headlight2006 – 2007 D1S
High Beam Headlight2006 – 2007 H7
Front Fog Light2006 – 2007 9006
Back Up Light2006 – 2007 921
Brake2006 – 2007 1156
License Plate2006 – 2007 6418
Rear Turn Signal2006 – 2007 PY21W
Tail Light2006 – 2007 1156
Front Inner Turn Signal2006 – 2007 PY21W
Front Outer Turn Signal2006 – 2007 12396NA
Glove Box2006 – 2007 DE3423
Interior Door2006 – 2007 194
Stepwell2006 – 2007 12844
Trunk2006 – 2007 6411