Ford Galaxie 500 Dome Light Bulb Size

The Ford Galaxie 500 dome light utilizes bulb sizes 561, 105, and 1003 depending on the specific production version. Available data covers the range from 1962 through 1974.

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
1972-1974	561
1970-1971	105
1962-1969	1003

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	561
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 13W.	105
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1003

Other Locations

Additional Notes

The 1003 bulb is the most frequently specified dome light bulb across the Ford Galaxie 500 range, covering the 1962-1969 model years.
The 1003 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W, and meets ANSI standards for the US and Canadian markets.
The BA15s bayonet base uses a single contact pin, which locks the bulb into its socket with a push-and-twist motion.
The 105 bulb, specified for the 1970-1971 Ford Galaxie 500, shares the same BA15s bayonet base as the 1003 but is a variant of the 1156 bulb type and draws less wattage at 13W.
Because the 105 and 1003 share the same BA15s base, physical fitment between the two types is possible, though their wattage ratings differ and they are not designated as interchangeable in these specifications.
The 561 festoon bulb, specified for 1972-1974, represents a distinct bulb format from the bayonet-base types used in earlier model years, as it makes contact through metal end caps rather than a base socket.
The 561 festoon bulb is 44mm in length and is rated at 12V and 12W, making it the lowest-wattage dome light bulb across all years listed.
Festoon bulbs such as the 561 are held in place by spring-loaded clips at each end, a mounting method that is mechanically incompatible with bayonet-base sockets used in earlier Galaxie 500 model years.
All three bulb types listed, the 561, 105, and 1003, conform to ANSI standards applicable in both the United States and Canada.
The dome light bulb specification for the Ford Galaxie 500 changed twice across the 1962-1974 production span, transitioning from the 1003 to the 105 after 1969, and then from the 105 to the 561 after 1971.