Chevrolet El Camino Courtesy Bulb Size

Chevrolet El Camino courtesy bulb sizes include 906, 631, and 1445 bulb configurations across various model generations. The replacement chart covers vehicle production years spanning 1959 to 1987.

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
1987	906
1984-1986	631
1983	906
1981-1982	631
1980	906
1978-1979	1445
1973-1977	89
1972	212-2
1971	89
1964-1970	631
1959-1960	89

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W.	631
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 2W.	1445
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	89
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2

Other Locations

Additional Notes

The courtesy bulb specifications for the Chevrolet El Camino span model years 1959 through 1987, covering five distinct bulb types across that range.
The 631 is the most frequently specified courtesy bulb across the El Camino's production history, appearing in model years 1964-1970, 1981-1982, and 1984-1986. It is an ANSI-standard single-filament bulb with a BA15s bayonet base, rated at 12V and 21W, and is classified as a variant of the 1156.
The 89 bulb is the second most common type in these specifications, used in model years 1959-1960, 1971, and 1973-1977. Like the 631, it uses a BA15s bayonet base, but operates at a lower wattage of 13W at 12V, making it a lower-power variant of the 1156 family.
Because both the 631 and the 89 share the BA15s bayonet base, they are physically compatible in terms of socket fitment, but their wattage ratings differ at 21W and 13W respectively. Substituting one for the other without accounting for this wattage difference may affect circuit performance.
The 906 is specified for model years 1980, 1983, and 1987. It is a T10 miniature wedge bulb rated at 12V and 8W. Its wedge base is physically distinct from the BA15s bayonet base used by the 631 and 89, meaning these types are not interchangeable.
The 1445 bulb is specified for the 1978-1979 El Camino. It uses a BA9s base, which is a smaller bayonet fitting than the BA15s, and is rated at only 2W. This low wattage makes it notably different in output from all other bulb types listed in these specifications.
The 212-2 is specified exclusively for the 1972 El Camino. It is a festoon-type bulb with a 41mm length and an SV8.5 base, rated at 12V and 12W. The festoon format is physically incompatible with all other base types present in these specifications.
All five bulb types listed carry ANSI standardization applicable to both the United States and Canada, indicating consistent regulatory classification across the full range of specified fitments.
The El Camino's courtesy bulb fitment changed multiple times across its production run, with no single bulb type used in consecutive decades throughout the entire span of the specifications.
The 1972 model year stands as the only year in these specifications to use a festoon-format bulb, while all surrounding model years use either bayonet-base or wedge-base types, none of which accept a festoon fitment.