When doing replacement or upgrading on 1994 – 2005 Mercedes-Benz C220 C320 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.

High Beam and Low Beam Headlight1994 – 1996 9003
Front Fog Light1994 – 1996 H3-55W
Back Up Light1994 – 1996 1156
Brake1994 – 1996 1156
Dome Light1994 – 1996 578
Front Side Marker1994 – 1996 P21/5W
Front Turn Signal1994 – 1996 P21/5W
License Plate1994 – 1996 6418
Parking Light1994 – 1996 1157
Rear Side Marker1994 – 1996 12821
Rear Turn Signal1994 – 1996 1156
Glove Box1994 – 1996 DE3423
Inner Tail Light1994 – 1996 P21/4W
Interior Door1994 – 1996 DE3423
Outer Tail Light1994 – 1996 12821
Rear Fog Light1994 – 1996 P21/4W
Trunk1994 – 1996 6411
Low Beam Headlight2001 – 2005 H7
High Beam Headlight2001 – 2005 H7
Front Fog Light2001 – 2005 9006
Back Up Light2001 – 2005 1156
Brake2001 – 2002 1156
2003 – 2005 1157
Dome Light2001 – 2005 578
Front Side Marker2001 – 2005 12961
Front Turn Signal2001 – 2005 1156
License Plate2001 – 2005 12844
Parking Light2001 – 2005 194
Rear Side Marker2001 – 2005 12821
Rear Turn Signal2001 – 2005 PY21W
Tail Light2003 – 2005 1157
Glove Box2001 – 2005 DE3423
Map Light2003 – 2005 6411
Trunk2001 – 2005 6411
Low Beam Headlight2001 – 2002 D2R
2003 – 2005 D2S
High Beam Headlight2001 – 2005 H7
Front Fog Light2001 – 2005 9006
Back Up Light2001 – 2005 1156
Brake2001 – 2002 1156
2003 – 2005 1157
Dome Light2001 – 2002 578
2003 – 2005 6411
Front Side Marker2001 – 2005 12961
Front Turn Signal2001 – 2002 1156
2003 – 2005 2357
License Plate2001 – 2005 12844
Parking Light2004 12961
2001 – 2003, 2005 194
Rear Side Marker2001 – 2005 12821
Rear Turn Signal2001 – 2005 PY21W
Tail Light2003 – 2005 1157
Glove Box2001 – 2005 DE3423
Map Light2003 – 2005 6411
Trunk2001 – 2005 6411