When doing replacement or upgrading on 2001 – 2018 BMW 330i 330Ci 330e 330xi GT xDrive Adaptive 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 Headlight2001 – 2006 H7
High Beam Headlight2001 – 2006 H7
Front Fog Light2001 – 2006 9006
Back Up Light2001 – 2006 1156
Brake2001 – 2006 1156
Dome Light2004 – 2006 194
2001 DE3423
Front Side Marker2002 – 2006 12961
2001 P21/5W
License Plate2001 – 2006 12844
Parking Light2001 12961
2002 – 2006 194
Rear Side Marker2001 – 2003 P21/4W
Rear Turn Signal2004 – 2006 1156
Tail Light2001 – 2006 P21/4W
Front Inner Turn Signal2001 1156
Front Outer Turn Signal2001 12961
Courtesy2002 – 2006 6418
Glove Box2001 – 2006 DE3423
Map Light2004 – 2006 12961
Stepwell2001 DE3423
Trunk2001 – 2006 6411
Low Beam Headlight2001 D2S
High Beam Headlight2001 H7
High Beam and Low Beam Headlight2002 – 2006 D2S
Front Fog Light2001 – 2006 9006
Back Up Light2001 – 2006 1156
Brake2001 – 2006 1156
Daytime Running Light2002 – 2006 H7
Dome Light2004 – 2006 194
2001 DE3423
Front Side Marker2002 – 2006 12961
2001 P21/5W
License Plate2001 – 2006 12844
Parking Light2001 12961
2002 – 2006 194
Rear Side Marker2001 – 2003 P21/4W
Rear Turn Signal2004 – 2006 1156
Tail Light2001 – 2006 P21/4W
Front Inner Turn Signal2001 P21W
Front Outer Turn Signal2001 12961
Courtesy2002 – 2006 6418
Glove Box2001 – 2006 DE3423
Map Light2004 – 2006 12961
Stepwell2001 DE3423
Trunk2001 – 2006 6411
Low Beam Headlight2016 – 2018 H7
High Beam Headlight2016 – 2018 H7
Front Fog Light2016 – 2018 H8
Dome Light2016 – 2018 194
Front Turn Signal2016 – 2018 3457NA
Parking Light2016 – 2018 3457
Brake2016 – 2018 H21W
Dome Light2016 – 2018 12961
Low Beam Headlight2001 – 2006, 2017 – 2018 H7
High Beam Headlight2001 – 2006, 2017 – 2018 H7
Front Fog Light2001 9006
2017 – 2018 H8
2002 – 2006 H8/H11/H16
Back Up Light2001 – 2006 1156
Brake2001 – 2006 1156
Dome Light2017 – 2018 194
2001, 2004 – 2006 DE3423
Front Side Marker2002 – 2006 12961
2001 P21/5W
Front Turn Signal2017 – 2018 3457NA
2002 – 2003 P21W
License Plate2001 – 2006 12844
Parking Light2001 12961
2002 – 2006 194
2017 – 2018 3457
Rear Side Marker2001 – 2003 P21/4W
Rear Turn Signal2006 1156
2004 – 2005 P21W
Tail Light2004 – 2006 1156
2001 – 2003 P21/4W
Front Inner Turn Signal2001 1156
2004 – 2006 PY21W
Front Outer Turn Signal2001, 2004 – 2006 12961
Courtesy2002 – 2006 6418
Glove Box2001 – 2006 DE3423
Interior Door2004 – 2006 194
Map Light2004 – 2006 12961
Rear Reading Light2004 – 2006 194
Stepwell2004 – 2006 12961
2001 DE3423
Trunk2001 – 2006 6411
Low Beam Headlight2001 D2S
High Beam Headlight2001 H7
High Beam and Low Beam Headlight2002 – 2006 D2S
Front Fog Light2001 9006
2002 – 2006 H11
Back Up Light2001 – 2006 1156
Brake2001 – 2006 1156
Daytime Running Light2002 – 2006 H7
Dome Light2001, 2004 – 2006 DE3423
Front Side Marker2002 – 2006 12961
2001 P21/5W
Front Turn Signal2002 – 2003 P21W
License Plate2001 – 2006 12844
Parking Light2001 12961
2002 – 2006 194
Rear Side Marker2001 – 2003 P21/4W
Rear Turn Signal2004 – 2006 1156
Tail Light2004 – 2006 1156
2001 – 2003 P21/4W
Front Inner Turn Signal2001 P21W
2004 – 2006 PY21W
Front Outer Turn Signal2001, 2004 – 2006 12961
Courtesy2002 – 2006 6418
Glove Box2001 – 2006 DE3423
Interior Door2004 – 2006 194
Map Light2004 – 2006 12961
Rear Reading Light2004 – 2006 194
Stepwell2004 – 2006 12961
2001 DE3423
Trunk2001 – 2006 6411
Brake2017 – 2018 H21W
Dome Light2017 – 2018 12961
Brake2017 – 2018 H21W
Glove Box2017 – 2018 12961
Interior Door2017 – 2018 194
Stepwell2017 – 2018 12961
Low Beam Headlight2017 – 2018 H7
High Beam Headlight2017 – 2018 H7
Front Fog Light2017 – 2018 H8
Dome Light2017 – 2018 194
Front Turn Signal2017 – 2018 3457NA
Parking Light2017 – 2018 3457
Brake2017 – 2018 H21W
Dome Light2017 – 2018 12961
Low Beam Headlight2001 – 2006 H7
High Beam Headlight2001 – 2006 H7
Front Fog Light2001 9006
2002 – 2006 H8/H11/H16
Back Up Light2001 – 2006 1156
Brake2001 – 2006 1156
Dome Light2001, 2004 – 2006 DE3423
Front Side Marker2002 – 2006 12961
2001 P21/5W
Front Turn Signal2002 – 2003 P21W
License Plate2001 – 2006 12844
Parking Light2001 12961
2002 – 2006 194
Rear Side Marker2001 – 2003 P21/4W
Rear Turn Signal2005 – 2006 1156
2004 P21W
Tail Light2004 – 2006 1156
2001 – 2003 P21/4W
Front Inner Turn Signal2001 1156
2004 – 2006 PY21W
Front Outer Turn Signal2001, 2004 – 2006 12961
Courtesy2002 – 2006 6418
Glove Box2001 – 2006 DE3423
Interior Door2004 – 2006 194
Map Light2004 – 2006 12961
Rear Reading Light2004 – 2006 194
Stepwell2004 – 2006 12961
2001 DE3423
Trunk2001 – 2006 6411
Low Beam Headlight2001 D2S
High Beam Headlight2001 H7
High Beam and Low Beam Headlight2002 – 2006 D2S
Front Fog Light2001 9006
2002 – 2006 H11
Back Up Light2001 – 2006 1156
Brake2001 – 2006 1156
Daytime Running Light2002 – 2006 H7
Dome Light2001, 2004 – 2006 DE3423
Front Side Marker2002 – 2006 12961
2001 P21/5W
Front Turn Signal2002 – 2003 P21W
License Plate2001 – 2006 12844
Parking Light2001 12961
2002 – 2006 194
Rear Side Marker2001 – 2003 P21/4W
Rear Turn Signal2004, 2006 1156
2005 P21W
Tail Light2004 – 2006 1156
2001 – 2003 P21/4W
Front Inner Turn Signal2001 P21W
2004 – 2006 PY21W
Front Outer Turn Signal2001, 2004 – 2006 12961
Courtesy2002 – 2006 6418
Glove Box2001 – 2006 DE3423
Interior Door2004 – 2006 194
Map Light2004 – 2006 12961
Rear Reading Light2004 – 2006 194
Stepwell2004 – 2006 12961
2001 DE3423
Trunk2001 – 2006 6411