Buick GS Map Light Bulb Size

The Buick GS map light requires bulb size 211-2, 194, or 89 depending on the specific application. Data for the bulb sizes covers the range from 1970 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
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 GS map light bulb specification changed across each of the three model years listed, with a different bulb type assigned to 1970, 1971, and 1972 respectively.
The 1972 Buick GS map light uses the 211-2 bulb, a festoon-type unit with a 41mm length and an SV8.5 base, rated at 12V and 12W.
Festoon bulbs are cylindrical lamps that mount by contact pressure at both ends rather than by a socket or base pin, which is a distinct fitment method from the other two bulb types listed for this model.
The 1971 GS map light takes the 194 bulb, a T10 miniature wedge type rated at 12V and 3.78W, making it the lowest-wattage bulb across the three model years in these specifications.
The wedge base of the 194 bulb is held in place by the tension of the socket itself rather than by a bayonet or pin mechanism, which means it is not interchangeable with bayonet-base or festoon-base sockets.
The 1970 GS map light uses the 89 bulb, which carries a BA15s single-contact bayonet base and is rated at 12V and 13W, making it the highest-wattage bulb among the three years listed.
The 89 bulb is a lower-wattage variant of the 1156 bulb and shares the same BA15s bayonet base, though the wattage difference means the two are not equivalent replacements despite the shared base type.
All three bulb types, the 211-2, 194, and 89, conform to ANSI standards applicable in both the United States and Canada.
Because each of the three model years uses a structurally different bulb base, the map light bulbs for the 1970, 1971, and 1972 GS are not interchangeable with one another.