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 Headlight 2001 H7
High Beam Headlight 2001 H1
Front Fog Light 2001 9006
Back Up Light 2001 1156
Brake 2001 2357
Dome Light 2001 DE3175
Front Side Marker 2001 168
Front Turn Signal 2001 2357
License Plate 2001 168
Parking Light 2001 2357
Rear Turn Signal 2001 1156
Tail Light 2001 2357
Center High Mount Stop Light 2001 1156
Courtesy 2001 168
Map Light 2001 168
Trunk 2001 DE3175
Low Beam Headlight 2002 – 2003 H7
High Beam Headlight 2002 – 2003 H1
Front Fog Light 2002 – 2003 9006
Back Up Light 2002 – 2003 1156
Brake 2002 – 2003 2357
Dome Light 2002 – 2003 DE3175
Front Side Marker 2002 – 2003 168
Front Turn Signal 2002 – 2003 2357
License Plate 2002 – 2003 168
Parking Light 2002 – 2003 2357
Rear Side Marker 2002 – 2003 168
Rear Turn Signal 2002 – 2003 1156
Tail Light 2002 – 2003 2357
Center High Mount Stop Light 2002 – 2003 1156
Courtesy 2002 – 2003 168
Map Light 2002 – 2003 168
Trunk 2002 – 2003 DE3175
Low Beam Headlight 2004 – 2005 H7
High Beam Headlight 2004 – 2005 H1
Front Fog Light 2004 – 2005 9006
Back Up Light 2004 – 2005 1156
Brake 2004 – 2005 1157
Dome Light 2004 – 2005 DE3175
Front Side Marker 2004 – 2005 168
Front Turn Signal 2004 – 2005 2357NA
License Plate 2004 – 2005 168
Parking Light 2004 – 2005 2357
Rear Side Marker 2004 – 2005 168
Rear Turn Signal 2004 – 2005 1156
Tail Light 2004 – 2005 1157
Courtesy 2004 – 2005 168
Trunk 2004 – 2005 DE3175
Low Beam Headlight 2004 – 2005 D2R
High Beam Headlight 2004 – 2005 H1
Front Fog Light 2004 – 2005 9006
Back Up Light 2004 – 2005 1156
Brake 2004 – 2005 1157
Dome Light 2004 – 2005 DE3175
Front Side Marker 2004 – 2005 168
Front Turn Signal 2004 – 2005 2357NA
License Plate 2004 – 2005 168
Parking Light 2004 – 2005 2357
Rear Side Marker 2004 – 2005 168
Rear Turn Signal 2004 – 2005 1156
Tail Light 2004 – 2005 1157
Courtesy 2004 – 2005 168
Trunk 2004 – 2005 DE3175