When doing replacement or upgrading on 2005 – 2010 Buick Allure 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 2005 – 2009 H11
High Beam Headlight 2005 – 2009 H9
Front Fog Light 2005 – 2009 H8/H11/H16
Back Up Light 2005 – 2009 921
Brake 2005 – 2009 3057
Daytime Running Light 2005 – 2009 H8/H11/H16
Dome Light 2005 – 2009 194
Front Side Marker 2005 – 2009 194
Front Turn Signal 2005 – 2009 4157
License Plate 2005 – 2009 194
Parking Light 2005 – 2009 4157
Rear Side Marker 2005 – 2009 194
Rear Turn Signal 2005 – 2009 3057
Courtesy 2005 – 2009 194
Glove Box 2005 – 2009 194
Inner Tail Light 2005 – 2009 194
Map Light 2005 – 2009 168
Outer Tail Light 2005 – 2009 3057
Trunk 2005 – 2009 912
Low Beam Headlight 2010 H11
High Beam Headlight 2010 H9
Front Fog Light 2010 H8/H11/H16
Back Up Light 2010 921
Daytime Running Light 2010 H11
Dome Light 2010 12961
Front Side Marker 2010 3757NA
Front Turn Signal 2010 3757NA
License Plate 2010 194
Parking Light 2010 3757NA
Rear Turn Signal 2010 3757NA
Courtesy 2010 194
Glove Box 2010 194
High Beam and Low Beam Headlight 2010 D1S
Front Fog Light 2010 H8/H11/H16
Back Up Light 2010 921
Daytime Running Light 2010 3157
Dome Light 2010 194
Front Side Marker 2010 3757NA
Front Turn Signal 2010 3757NA
License Plate 2010 12961
Parking Light 2010 3757NA
Rear Turn Signal 2010 3757NA
Courtesy 2010 194
Glove Box 2010 194