Buick Invicta Dome Light Bulb Size

The Buick Invicta dome light requires bulb size 1004 or 90 depending on the specific configuration of the interior lighting system. Data for the bulb sizes covers the range from 1959 to 1963.

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
1963	1004
1960-1962	90
1959	1004

Bulb Specifications

Description	Bulb Size
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 Buick Invicta dome light draws from two ANSI-standard bulb types across its 1959-1963 model years: the 1004 and the 90.
The 1004 is a dual-filament bulb rated at 12V and 21/5W, mounted on a BAY15d bayonet base, and is described as a variant of the widely known 1157.
The 90 is a single-filament bulb rated at 12V and 13W, mounted on a BA15s bayonet base.
The BAY15d base of the 1004 and the BA15s base of the 90 are physically distinct and not interchangeable, as BAY15d features offset pins to accommodate its dual-filament design, while BA15s uses a single-contact configuration.
The Buick Invicta (1960-1962) uses the 90 bulb for the dome light across three consecutive model years.
The 1959 and 1963 model years share the 1004 bulb, while the intervening 1960-1962 years use the 90, indicating the dome light socket specification changed between the 1959 and 1960 models and again between the 1962 and 1963 models.
Both the 1004 and the 90 conform to ANSI standards applicable in the United States and Canada.
The wattage difference between the two bulbs is notable: the 90 draws 13W on its single filament, whereas the 1004 operates at either 21W or 5W depending on which of its two filaments is active.