Buick LaCrosse Dome Light Bulb Size

The Buick LaCrosse dome light requires 12961 and 168 bulb sizes depending on the specific version of the vehicle. Data for the components covers the period from 2005 through 2013.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2010-2013	12961
2005-2009	168

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The Buick LaCrosse dome light specifications cover model years 2005-2013, with two distinct bulb sizes used across that span.
The 12961 is a Philips part number designation for a miniature wedge bulb with a T10 envelope and a W2.1x9.5d base, rated at 12V and 5W.
The 168 is an ANSI standard designation recognized in the US and Canada, also a T10 miniature wedge bulb, rated at 12V and 4.9W.
Both bulbs share the T10 form factor and the same W2.1x9.5d wedge base type, which is a small two-pin wedge configuration common in low-wattage automotive interior applications.
The wattage difference between the two bulbs is minimal, with the 12961 rated at 5W and the 168 rated at 4.9W.
The Buick LaCrosse (2010-2013) uses the 12961 bulb for the dome light position.
Model years 2005-2009 use the 168 bulb instead, representing a different specification from the later generation.
Because the 12961 and 168 carry different part number systems, one being a manufacturer-specific designation and the other an ANSI industry standard, direct substitution between the two warrants attention to base and voltage compatibility before installation.