Lincoln MKZ Dome Light Bulb Size

The Lincoln MKZ dome light requires a 578 bulb size for proper installation and function within the interior lighting housing. Data for the specified component covers the range from 2007 to 2012.

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
2007-2012	578

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578

Other Locations

Additional Notes

The Lincoln MKZ uses the 578 bulb for the dome light across the 2007-2012 model years.
The 578 is a festoon-style bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base socket.
The 578 bulb measures 41mm in length, which is the critical fitment factor for festoon bulbs, as the end caps must bridge the contact points within the fixture housing.
The 578 operates at 12 volts and 12 watts, which is consistent with standard automotive interior lighting circuits.
The 578 designation follows the ANSI standard recognized in both the United States and Canada, meaning the specification applies uniformly across North American markets.
Festoon bulbs of the same length are not always interchangeable, as wattage and voltage ratings must also match the vehicle's circuit requirements to avoid electrical issues or premature failure.