Buick Sportwagon Map Light Bulb Size

The Buick Sportwagon map light uses bulb sizes 211-2, 194, and 89 across various production versions. Available data for the specified lighting components covers the range from 1964 to 1972.

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	211-2
1971	194
1964-1970	89

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	89

Other Locations

Additional Notes

The Buick Sportwagon map light specifications span the 1964-1972 model years, with three distinct bulb types used across that period.
The bulb 89 is the most frequently specified type in these records, covering the Buick Sportwagon from 1964-1970, a span of seven consecutive model years.
The 89 bulb is a single-filament type with a BA15s bayonet base, operating at 12V and 13W. It is an ANSI-standardized part valid in both the US and Canada, and is considered a lower wattage variant of the 1156 bulb.
A BA15s bayonet base uses a single contact pin, which distinguishes it from the dual-pin BA15d base. This single-pin configuration is relevant to fitment, as substituting a dual-contact bayonet bulb would result in an incompatible fit.
The 1971 Sportwagon uses the 194, a miniature wedge bulb of the T10 type, operating at 12V and 3.78W. At roughly one-quarter the wattage of the 89, it represents a notably lower power draw.
The T10 wedge base of the 194 bulb is not interchangeable with the BA15s bayonet base of the 89. These two bulb types require different socket designs, making them incompatible with each other's housings.
The 1972 Sportwagon uses the 211-2, a festoon bulb with an SV8.5 base and a 41mm length, rated at 12V and 12W. Festoon bulbs seat by spring tension at both ends rather than using a base socket, which is a fundamentally different mounting method from either the wedge or bayonet types used in prior years.
The SV8.5 designation on the 211-2 refers to the end cap style of the festoon bulb. Festoon bulbs of differing lengths or end cap types are generally not interchangeable, so the 41mm length and SV8.5 base are both relevant to correct fitment.
All three bulb types in these specifications, the 89, 194, and 211-2, are ANSI-standardized parts recognized in both the US and Canada, meaning they conform to a defined set of electrical and physical standards rather than being proprietary designs.
The Sportwagon map light socket changed at least twice across the 1964-1972 model range, transitioning from the BA15s bayonet of the 89 to the T10 wedge of the 194 in 1971, and then to the SV8.5 festoon of the 211-2 in 1972. Each of these base types is physically distinct and not cross-compatible.