Chevrolet C60 Courtesy Bulb Size

The Chevrolet C60 courtesy light uses bulb sizes 90, 1003, and 211-2 depending on the specific production period. Available information covers the time range from 1960 through 1988.

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
1988	211-2
1985-1987	90
1983-1984	1003
1982	211-2
1980-1981	90
1979	211-2
1976-1978	90
1972-1975	211-2
1963-1971	90
1961-1962	211-2
1960	90

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W.	90
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1003

Other Locations

Additional Notes

The Chevrolet C60 courtesy bulb specifications span model years 1960 through 1988, with three distinct bulb types appearing across that range: the 211-2, the 90, and the 1003.
The type 90 bulb is the most frequently specified across the C60 courtesy bulb data, appearing in the majority of model years. It is a single-filament bulb with a BA15s bayonet base, rated at 12V and 13W under the ANSI standard applicable to the US and Canada.
The 211-2 is the second most common bulb type in these specifications. It is a festoon bulb with an SV8.5 base and a 41mm length, also rated at 12V but drawing 12W, and it likewise conforms to the ANSI standard for the US and Canada.
The BA15s bayonet base shared by the type 90 and type 1003 bulbs is a single-contact bayonet fitting. Despite this shared base type, the two bulbs are not interchangeable, as the 1003 is rated at 21W compared to the 13W rating of the type 90, representing a significant difference in power draw.
The 1003 bulb is specified only for the Chevrolet C60 in model years 1983-1984. Its higher wattage relative to the other two bulb types in these specifications means substituting a lower-wattage bulb in those years would result in reduced output.
The 211-2 festoon bulb uses an SV8.5 base, which is physically distinct from the BA15s bayonet base used by both the 90 and 1003 types. This difference in base design means festoon and bayonet bulbs are not cross-compatible regardless of voltage or wattage ratings.
The type 90 and 211-2 bulbs share the same 12V operating voltage but differ in wattage, with the 211-2 drawing 12W and the type 90 drawing 13W. The base types are also different, making direct substitution between them physically impossible without modification to the socket.
Model years 1982 and 1988 specify the 211-2 festoon bulb, while the immediately adjacent years in the data specify the type 90, indicating that the courtesy bulb socket configuration of the C60 changed at certain points across the production span covered by these specifications.