When doing replacement or upgrading on 2006 – 2011 Mercedes-Benz B200 with capsule halogen headlamps HID, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight2006 – 2011 H7
High Beam Headlight2006 – 2011 H7
Front Fog Light2006 – 2011 H8/H11/H16
Back Up Light2006 – 2011 1156
Brake2006 – 2011 1157
Dome Light2006 – 2011 578
Front Side Marker2006 – 2011 12961
Front Turn Signal2006 – 2011 PY21W
License Plate2006 – 2011 12844
Parking Light2006 – 2011 194
Rear Side Marker2006 – 2011 P21/5W
Rear Turn Signal2006 – 2011 PY21W
Tail Light2006 – 2011 1157
Luggage Compartment2006 – 2011 6411
Glove Box2006 – 2011 DE3423
Interior Door2006 – 2011 578
Map Light2006 – 2011 12961
Stepwell2006 – 2011 12844
High Beam and Low Beam Headlight2006 – 2011 D1S
Front Fog Light2006 – 2011 H8/H11/H16
Back Up Light2006 – 2011 1156
Brake2006 – 2007, 2009, 2011 1157
2008, 2010 P21/5W
Dome Light2006 – 2011 578
Front Side Marker2006 – 2011 194
Front Turn Signal2006 – 2011 PY21W
License Plate2006 – 2011 12844
Parking Light2006 – 2011 194
Rear Side Marker2006 – 2011 P21/5W
Rear Turn Signal2006 – 2011 PY21W
Tail Light2006 – 2011 1157
Luggage Compartment2006 – 2011 6411
Glove Box2006 – 2011 DE3423
Interior Door2006 – 2011 578
Map Light2006 – 2011 12961
Stepwell2006 – 2011 12844