Chevrolet Chevelle Courtesy Bulb Size

The Chevrolet Chevelle courtesy light utilizes unique bulb sizes 212-2, 89, 631, and 211-2 depending on the specific version. Data for the light covers the range from 1964 to 1973.

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
1973	212-2
1972	89
1968-1971	631
1966-1967	211-2
1964-1965	631

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	89
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W.	631
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2

Other Locations

Additional Notes

The bulb type 631 is the most frequently specified courtesy bulb across the Chevrolet Chevelle's model years covered, appearing in the 1964-1965 and 1968-1971 model years.
The 631 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W, and is classified as a variant of the 1156 bulb under the ANSI standard used in both the US and Canada.
The 211-2 festoon bulb was specified for the Chevrolet Chevelle in 1966-1967, operating at 12V and 12W with a 41mm length and an SV8.5 base.
The 212-2, specified for the 1973 model year, shares the same 41mm length, SV8.5 base, 12V rating, and 12W output as the 211-2, making the two festoon bulbs technically identical in their rated specifications.
Despite their matching electrical and physical specifications, the 211-2 and 212-2 are listed as distinct ANSI part numbers and are not confirmed as interchangeable within these specifications.
The 89 bulb, specified for the 1972 model year, uses the same BA15s bayonet base as the 631 but draws only 13W compared to the 631's 21W, making it a lower-wattage variant of the 1156 family.
The shift from the 631 (21W) in 1971 to the 89 (13W) in 1972 represents a reduction in wattage for the courtesy bulb application, with both bulbs sharing the BA15s bayonet base format.
All four bulb types listed across these model years conform to ANSI standards recognized in both the US and Canada, and all are rated for 12V electrical systems.