Ford Country Squire Dome Light Bulb Size

The Ford Country Squire dome light utilizes unique bulb sizes 561, 105, 912, 906, 1003, and 63 depending on the specific version of the vehicle. Available data covers the range of 1950 through 1991 for the components listed in the provided specifications.

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
1991	561
1990	105
1989	912
1988	906
1987	912
1972-1974	561
1970-1971	105
1956-1969	1003
1950-1955	63

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). Wedge bulb (T15). Variant of 921. 12V, 12W.	912
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906
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 Ford Country Squire dome light draws from six distinct bulb types across its production span: the 561, 105, 912, 906, 1003, and 63.
The 1003 is the most frequently specified bulb in the Ford Country Squire dome light fitment data, covering model years 1956-1969. It is a single-filament bulb with a BA15s bayonet base rated at 12V and 21W.
The bulb 63 is a single-filament type with a BA9s base rated at 12V and 0.63W, specified for the 1950-1955 model years. At 0.63W, it draws substantially less power than any other bulb type in these specifications.
The 561 is a festoon-style bulb with a 44mm length and end-cap contacts, rated at 12V and 12W. It is specified for the 1972-1974 and 1991 model years of the Ford Country Squire.
Both the 105 and the 1003 share the BA15s bayonet base, which means their physical base type is identical. However, the 105 is rated at 13W while the 1003 is rated at 21W, making them electrically incompatible as direct substitutes despite the shared base design.
The 912 is a T15 wedge bulb rated at 12V and 12W, specified for the 1987 and 1989 model years. It is noted as a variant of the 921 bulb.
The 906 is a T10 miniature wedge bulb rated at 12V and 8W, specified exclusively for the 1988 model year. At 8W, it is the lowest-wattage wedge-type bulb in these specifications.
The 912 and 906 both use wedge-style bases, but they belong to different size classes, T15 and T10 respectively, and are not interchangeable despite their physical similarity.
The 105 bulb is described as a variant of the 1156. The 1156 is a widely used BA15s single-filament automotive bulb, and the 105 shares its base type while differing in wattage output.
All six bulb types in these specifications conform to ANSI standards applicable in both the United States and Canada.