Buick Estate Wagon Map Light Bulb Size

The Buick Estate Wagon Map Light requires bulb sizes 1004, 211-2, 561, 194, and 90 depending on the specific version. Data for the components covers the range from 1959 to 1982.

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
1982	1004
1975-1981	211-2
1974	561
1972-1973	211-2
1971	194
1962-1964	90
1959-1960	90

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1004
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
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W.	90

Other Locations

Additional Notes

The 211-2 is the most frequently specified map light bulb across the Buick Estate Wagon's model history, appearing in nine of the seventeen model years listed, spanning 1972-1981 with the exception of 1974.
The 211-2 is a festoon-type bulb with an SV8.5 base and a 41mm length, operating at 12V and 12W under ANSI standards applicable to the US and Canada.
The 561, used in the 1974 Buick Estate Wagon, is also a festoon bulb rated at 12V and 12W, but it measures 44mm in length and uses end-cap contacts rather than the SV8.5 base found on the 211-2. These two bulbs are not interchangeable despite sharing the same voltage and wattage.
The 1004, specified for the 1982 model year, is a dual-filament bulb with a BAY15d bayonet base, rated at 12V and 21/5W. It is described as a variant of the 1157 bulb type.
The 90 bulb, used across the 1959-1960 and 1962-1964 model years, is a single-filament bulb with a BA15s bayonet base, rated at 12V and 13W.
The BA15s base on the 90 bulb is a single-contact bayonet fitting, while the BAY15d base on the 1004 is a dual-contact bayonet fitting with offset pins. These two base types are physically distinct and not interchangeable.
The 194, specified for the 1971 Buick Estate Wagon, is a miniature wedge bulb of the T10 type, rated at 12V and 3.78W. Its wattage is substantially lower than every other bulb type listed in these specifications.
Festoon bulbs such as the 211-2 and 561 differ from the wedge, bayonet, and miniature types in that they are held in place by spring-loaded end contacts rather than a socket or base fitting, which affects housing compatibility.