Chevrolet Corvair Map Light Bulb Size

The Chevrolet Corvair map light utilizes bulb size 211-2 and bulb size 90 for interior illumination. Data for the specific components covers the range from 1960 through 1969.

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 Type	Shop
1965-1969	211-2	Check Price
1960-1964	90	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2	Check Price
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W.	90	Check Price

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Additional Notes

The Chevrolet Corvair map light specifications cover the 1960-1969 model years, with two distinct bulb types used across that span.
The 211-2 is a festoon-style bulb measuring 41mm in length with an SV8.5 base, rated at 12 volts and 12 watts, and conforming to ANSI standards applicable in the US and Canada.
The 90 is a single-filament bulb with a BA15s bayonet base, rated at 12 volts and 13 watts, and also conforming to ANSI standards applicable in the US and Canada.
The BA15s bayonet base of the 90 bulb features a single contact pin, which is the defining characteristic of the BA15s designation and distinguishes it from double-contact bayonet variants.
The SV8.5 base of the 211-2 bulb is a festoon-type contact base, where the bulb makes electrical contact at each end rather than through a pin or screw fitting.
Corvair models from 1960-1964 use the 90 bulb for the map light, while those from 1965-1969 use the 211-2.
The two bulb types are not interchangeable. The 90 uses a bayonet mounting mechanism, while the 211-2 relies on end-cap contacts within a festoon socket, making the socket designs physically incompatible.
Although both bulbs operate on 12 volts, the 90 draws 13 watts and the 211-2 draws 12 watts, reflecting a slight difference in power consumption between the two generations of fitment.