Lincoln MKS Map Light Bulb Size

The Lincoln MKS map light requires a 12961 bulb size for proper installation and function within the interior overhead lighting assembly. Available data covers the period from 2009 through 2016 for the specified vehicle components.

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
2009-2016	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 Lincoln MKS uses the 12961 bulb for the map light across all model years from 2009 to 2016.
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 the number indicating a width of 10 millimeters.
The 12961 uses a W2.1x9.5d wedge base, which is a pinless base type that is held in place by the socket walls rather than by pins or a bayonet mechanism.
The bulb operates at 12 volts and 5 watts, consistent with standard low-power interior lighting in passenger vehicles.
The W2.1x9.5d base designation is a standardized IEC specification, meaning the 12961 is not proprietary in its socket interface despite carrying a Philips part number.
Because the T10 wedge base is a widely standardized format, aftermarket and OEM-equivalent bulbs sharing the W2.1x9.5d base and 12V/5W rating are generally considered interchangeable with the 12961 in this application.
The consistent use of a single bulb specification across all eight model years of the Lincoln MKS indicates no mid-cycle revision to the map light socket or electrical requirements occurred during the vehicle's production run.