Pontiac GTO Dome Light Bulb Size

The Pontiac GTO dome light utilizes unique bulb sizes 1004, 194, 211-2, and DE3175 across various production periods. Available data covers the specific range from 1964 through 2006.

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
2004-2006	DE3175
1972-1973	211-2
1971	194
1965-1970	211-2
1964	1004

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1004

Other Locations

Additional Notes

The Pontiac GTO dome light specifications span three distinct bulb types across the 1964-2006 model range: the 1004, 211-2, 194, and DE3175, each representing a different socket and electrical configuration.
The DE3175 is a festoon-style bulb with a 31mm length and end-cap contacts operating at 12V. It is the specified dome light bulb for the 2004-2006 Pontiac GTO.
The 211-2 is also a festoon-style bulb but is physically larger, at 41mm in length, and uses an SV8.5 base rather than end-cap contacts. It is rated at 12V and 12W.
Because the DE3175 and 211-2 are both festoon bulbs yet differ in length and base type, the two are not interchangeable despite their shared form factor category.
The 211-2 is the most frequently specified bulb across the GTO dome light data, covering the 1965-1970 and 1972-1973 model years.
The 1971 GTO is the sole model year specified with the 194 bulb, a miniature wedge-type T10 bulb rated at 12V and 3.78W, which is a significantly lower wattage than the 211-2 used in surrounding years.
The 1964 GTO uses the 1004, a dual-filament bulb with a BAY15d bayonet base rated at 12V with a 21/5W output. Its dual-filament design and bayonet base make it mechanically and electrically distinct from all other bulb types in these specifications.
The 1004 is noted as a variant of the 1157, meaning it shares the BAY15d bayonet base configuration, though the two are not identical and substitution would require verification of filament and wattage compatibility.
All four bulb types listed in the Pontiac GTO dome light specifications conform to ANSI standards applicable in both the United States and Canada.
The shift from the 1004 bayonet-base bulb in 1964 to the 211-2 festoon format beginning in 1965 reflects a socket change in the GTO's dome light housing between those model years.