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 Headlight2005 – 2009 H11
High Beam Headlight2005 – 2009 H9
Front Fog Light2005 – 2009 H8/H11/H16
Back Up Light2005 – 2009 921
Brake2005 – 2009 3057
Daytime Running Light2005 – 2009 H8/H11/H16
Dome Light2005 – 2009 194
Front Side Marker2005 – 2009 194
Front Turn Signal2005 – 2009 4157
License Plate2005 – 2009 194
Parking Light2005 – 2009 4157
Rear Side Marker2005 – 2009 194
Rear Turn Signal2005 – 2009 3057
Courtesy2005 – 2009 194
Glove Box2005 – 2009 194
Inner Tail Light2005 – 2009 194
Map Light2005 – 2009 168
Outer Tail Light2005 – 2009 3057
Trunk2005 – 2009 912
Low Beam Headlight2010 H11
High Beam Headlight2010 H9
Front Fog Light2010 H8/H11/H16
Back Up Light2010 921
Daytime Running Light2010 H11
Dome Light2010 12961
Front Side Marker2010 3757NA
Front Turn Signal2010 3757NA
License Plate2010 194
Parking Light2010 3757NA
Rear Turn Signal2010 3757NA
Courtesy2010 194
Glove Box2010 194
High Beam and Low Beam Headlight2010 D1S
Front Fog Light2010 H8/H11/H16
Back Up Light2010 921
Daytime Running Light2010 3157
Dome Light2010 194
Front Side Marker2010 3757NA
Front Turn Signal2010 3757NA
License Plate2010 12961
Parking Light2010 3757NA
Rear Turn Signal2010 3757NA
Courtesy2010 194
Glove Box2010 194