BMW Z4 License Plate Bulb Size

The BMW Z4 license plate light requires a bulb with the specific 12961 size for proper installation and function. The provided data covers the time period from 2003 through 2008.

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
2003-2008	12961

Bulb Specifications

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

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Additional Notes

The BMW Z4 uses the 12961 bulb for its license plate lighting across the 2003-2008 model years.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor.
T10 refers to the bulb's tubular shape with a width of 10 millimeters, a standard sizing convention in automotive lighting.
The bulb uses a W2.1x9.5d base, which is the wedge-type base common to many low-wattage automotive applications, where the electrical contacts are made through the wedge itself rather than separate pins or a bayonet fitting.
The 12961 operates at 12 volts and 5 watts, consistent with the low-power requirements of license plate illumination.
At 5 watts, the bulb draws minimal current, which is typical for non-critical lighting positions such as license plate lamps.
The W2.1x9.5d base designation is standardized under international automotive bulb conventions, meaning fitment compatibility is determined by this base type rather than the Philips part number alone.
Substituting a bulb with a different base type, even one with identical wattage, would result in an incompatible fitment for the BMW Z4 license plate housing.