Pontiac Star Chief Dome Light Bulb Size

The Pontiac Star Chief dome light utilizes bulb sizes 211-2, 1004, and 90 depending on the specific application. Data for the lighting components covers the range from 1955 to 1966.

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
1965-1966	211-2
1963-1964	1004
1961-1962	211-2
1960	90
1955-1959	1004

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1004
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W.	90

Other Locations

Additional Notes

The Pontiac Star Chief dome light specifications span model years 1955 through 1966, covering twelve years of production across three distinct bulb types: the 211-2, the 1004, and the 90.
The 211-2 is a festoon-style bulb rated at 12V and 12W, built on an SV8.5 base with a 41mm length. Festoon bulbs seat into spring-clip holders at each end rather than inserting into a socket, which distinguishes their installation from bayonet-base types.
The 1004 is a dual-filament bulb rated at 12V with a 21/5W output, mounted on a BAY15d bayonet base. The BAY15d base features two offset pins, which physically prevents incorrect single-filament substitutes from seating properly.
The 90 is a single-filament bulb rated at 12V and 13W, using a BA15s bayonet base. The BA15s base has a single contact pin, making it mechanically incompatible with the dual-pin BAY15d socket used by the 1004.
The 1004 is noted as a variant of the 1157. Despite this relationship, the two are not interchangeable in all applications, as wattage and base pin offset specifications can differ between variants.
The Pontiac Star Chief used the 1004 bulb for model years 1955-1959, representing the longest continuous run of a single bulb type across the listed specifications.
The 211-2 festoon bulb was specified for the 1961-1962 and 1965-1966 model years. Because the SV8.5 base is a contact-end type rather than a pin-socket type, fitment depends on the physical length of the lamp housing's clip span matching the 41mm bulb length.
The 1963-1964 model years returned to the 1004 after the 211-2 had been specified for 1961-1962, indicating that the dome light housing design changed at least twice within the 1960s production run.
The 1960 model year stands as the sole year in the specifications calling for the 90 bulb. Its BA15s single-pin base is not compatible with sockets designed for the BAY15d 1004, nor with the clip-style housing required by the 211-2 festoon.
All three bulb types listed carry ANSI standard designations valid in both the United States and Canada, meaning the part numbers reference a consistent specification rather than a manufacturer-specific designation.