When doing replacement or upgrading on 2001 – 2005 Hyundai XG300 XG350 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 H7
High Beam Headlight2001 H1
Front Fog Light2001 9006
Back Up Light2001 1156
Brake2001 2357
Dome Light2001 DE3175
Front Side Marker2001 168
Front Turn Signal2001 2357
License Plate2001 168
Parking Light2001 2357
Rear Turn Signal2001 1156
Tail Light2001 2357
Center High Mount Stop Light2001 1156
Courtesy2001 168
Map Light2001 168
Trunk2001 DE3175
Low Beam Headlight2002 – 2003 H7
High Beam Headlight2002 – 2003 H1
Front Fog Light2002 – 2003 9006
Back Up Light2002 – 2003 1156
Brake2002 – 2003 2357
Dome Light2002 – 2003 DE3175
Front Side Marker2002 – 2003 168
Front Turn Signal2002 – 2003 2357
License Plate2002 – 2003 168
Parking Light2002 – 2003 2357
Rear Side Marker2002 – 2003 168
Rear Turn Signal2002 – 2003 1156
Tail Light2002 – 2003 2357
Center High Mount Stop Light2002 – 2003 1156
Courtesy2002 – 2003 168
Map Light2002 – 2003 168
Trunk2002 – 2003 DE3175
Low Beam Headlight2004 – 2005 H7
High Beam Headlight2004 – 2005 H1
Front Fog Light2004 – 2005 9006
Back Up Light2004 – 2005 1156
Brake2004 – 2005 1157
Dome Light2004 – 2005 DE3175
Front Side Marker2004 – 2005 168
Front Turn Signal2004 – 2005 2357NA
License Plate2004 – 2005 168
Parking Light2004 – 2005 2357
Rear Side Marker2004 – 2005 168
Rear Turn Signal2004 – 2005 1156
Tail Light2004 – 2005 1157
Courtesy2004 – 2005 168
Trunk2004 – 2005 DE3175
Low Beam Headlight2004 – 2005 D2R
High Beam Headlight2004 – 2005 H1
Front Fog Light2004 – 2005 9006
Back Up Light2004 – 2005 1156
Brake2004 – 2005 1157
Dome Light2004 – 2005 DE3175
Front Side Marker2004 – 2005 168
Front Turn Signal2004 – 2005 2357NA
License Plate2004 – 2005 168
Parking Light2004 – 2005 2357
Rear Side Marker2004 – 2005 168
Rear Turn Signal2004 – 2005 1156
Tail Light2004 – 2005 1157
Courtesy2004 – 2005 168
Trunk2004 – 2005 DE3175