When doing replacement or upgrading on 2004 – 2007 Buick Rainier, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight2004 – 2007 9006
High Beam Headlight2004 – 2007 9005
Front Fog Light2004 – 2007 H8/H11/H16
Back Up Light2004 – 2007 3157
Brake2004 – 2007 3157
Dome Light2004 – 2007 212-2
Front Side Marker2004 – 2007 194
Front Turn Signal2004 – 2007 3757NA
License Plate2004 – 2007 194
Parking Light2004 – 2007 3757NA
Rear Turn Signal2004 – 2007 3157
Tail Light2004 – 2007 3157
Luggage Compartment2004 – 2007 578
Courtesy2004 – 2007 194
Glove Box2004 – 2007 194
Map Light2004 – 2007 194