Ford Fairlane Dome Light Bulb Size

The Ford Fairlane dome light utilizes bulb sizes 63, 105, and 1003 depending on the specific version of the vehicle. Available information covers the range of 1955 through 1970 for the specified lighting 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
1970	105
1956-1969	1003
1955	63

Bulb Specifications

Description	Bulb Size
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
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 0.63W.	63

Other Locations

Additional Notes

The 1003 bulb is the dominant dome light specification for the Ford Fairlane, covering model years 1956-1969.
The 1003 is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base.
The 1970 Ford Fairlane uses the 105 bulb for its dome light, which differs from the 1003 used in prior model years.
The 105 is an ANSI-standard single-filament bulb rated at 12V and 13W, also fitted with a BA15s bayonet base, and is classified as a variant of the 1156.
Although the 1003 and 105 share the same BA15s bayonet base, their wattage ratings differ at 21W and 13W respectively, which makes them non-equivalent replacements despite physical base compatibility.
The 1955 Ford Fairlane uses the 63 bulb for its dome light, which is physically and electrically distinct from the bulbs specified for all other model years in these specifications.
The 63 is an ANSI-standard single-filament bulb rated at 12V and 0.63W, fitted with a BA9s base, making it incompatible with the BA15s-based bulbs used in other Fairlane model years.
The BA9s base on the 63 bulb is a miniature bayonet fitting, considerably smaller than the BA15s base found on both the 1003 and 105 bulbs.