Pontiac G8 License Plate Bulb Size

The Pontiac G8 license plate light requires a bulb size of 12961 for proper installation and function. Data for the specific lighting component covers the range from 2008 to 2009.

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
2008-2009	12961

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961

Other Locations

Additional Notes

The 12961 is the license plate bulb size for the Pontiac G8 across its 2008-2009 production run.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, which is one of the most widely used bulb types in automotive auxiliary lighting applications such as license plate, parking, and side marker positions.
The T10 designation refers to the bulb's tubular shape, with the number indicating its width in tenths of an inch, making it a physically small bulb suited to compact lamp housings.
The 12961 uses a W2.1x9.5d base, which is the standard wedge-type base for T10 bulbs. The wedge base relies on the bulb's glass envelope and wire leads to hold it in place rather than a separate metal shell, which is a common fitment method in license plate lamp assemblies.
The bulb operates at 12 volts and 5 watts, both of which are standard values for low-current auxiliary lighting circuits in passenger vehicles.
Because the W2.1x9.5d base is a standardized wedge format, T10 bulbs from multiple manufacturers are generally interchangeable in the G8's license plate socket, provided the voltage and wattage ratings are matched.