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 Headlight 2006 – 2011 H7
High Beam Headlight 2006 – 2011 H7
Front Fog Light 2006 – 2011 H8/H11/H16
Back Up Light 2006 – 2011 1156
Brake 2006 – 2011 1157
Dome Light 2006 – 2011 578
Front Side Marker 2006 – 2011 12961
Front Turn Signal 2006 – 2011 PY21W
License Plate 2006 – 2011 12844
Parking Light 2006 – 2011 194
Rear Side Marker 2006 – 2011 P21/5W
Rear Turn Signal 2006 – 2011 PY21W
Tail Light 2006 – 2011 1157
Luggage Compartment 2006 – 2011 6411
Glove Box 2006 – 2011 DE3423
Interior Door 2006 – 2011 578
Map Light 2006 – 2011 12961
Stepwell 2006 – 2011 12844
High Beam and Low Beam Headlight 2006 – 2011 D1S
Front Fog Light 2006 – 2011 H8/H11/H16
Back Up Light 2006 – 2011 1156
Brake 2006 – 2007, 2009, 2011 1157
2008, 2010 P21/5W
Dome Light 2006 – 2011 578
Front Side Marker 2006 – 2011 194
Front Turn Signal 2006 – 2011 PY21W
License Plate 2006 – 2011 12844
Parking Light 2006 – 2011 194
Rear Side Marker 2006 – 2011 P21/5W
Rear Turn Signal 2006 – 2011 PY21W
Tail Light 2006 – 2011 1157
Luggage Compartment 2006 – 2011 6411
Glove Box 2006 – 2011 DE3423
Interior Door 2006 – 2011 578
Map Light 2006 – 2011 12961
Stepwell 2006 – 2011 12844