Ford LTD II Dome Light Bulb Size

The Ford LTD II dome light requires bulb size 211-2 or 561 depending on the specific application. Data for the lighting components covers the range from 1977 to 1979.

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
1979	211-2
1978	561
1977	211-2

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	561

Other Locations

Additional Notes

The Ford LTD II uses two distinct festoon bulb types across its 1977-1979 model years: the 211-2 and the 561.
Both the 211-2 and 561 are ANSI-standard festoon bulbs rated at 12V and 12W, making them identical in voltage and wattage.
A festoon bulb is a cylindrical lamp that mounts horizontally between two contact points at either end of a housing, a form factor common in automotive dome light applications.
The 211-2 measures 41mm in length and uses an SV8.5 base, which features a metal sleeve around the glass envelope that makes contact with the fixture.
The 561 measures 44mm in length and uses end-cap contacts, meaning bare metal caps at each end of the bulb make direct contact with the fixture rather than a sleeved base.
The 3mm difference in length and the distinct base types between the 211-2 and the 561 mean the two bulbs are not interchangeable, despite sharing the same voltage and wattage ratings.
The Ford LTD II (1977 and 1979) specifies the 211-2, while the 1978 model year specifies the 561, indicating a change in dome light fixture design between those years.
Both bulb types carry ANSI designations valid in both the United States and Canada, reflecting a standardized North American automotive lighting specification.