Pontiac Fiero Dome Light Bulb Size

The Pontiac Fiero dome light requires bulb size 906 or 561 depending on the specific interior configuration. Data for the lighting components covers the range from 1984 to 1988.

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
1986-1988	906
1984-1985	561

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	561

Other Locations

Additional Notes

The Pontiac Fiero dome light uses two distinct bulb types across its production run: the 906 for model years 1986-1988 and the 561 for model years 1984-1985.
The 906 is an ANSI-standard miniature wedge bulb of the T10 type, rated at 12 volts and 8 watts.
The 561 is an ANSI-standard festoon bulb with end-cap contacts, a 44mm length, and a rating of 12 volts and 12 watts.
Wedge bulbs such as the 906 are retained by friction from the socket itself, with no separate base or pins required for installation.
Festoon bulbs such as the 561 make electrical contact through metal caps at each end, which press against spring-loaded clips within the fixture.
The 561 draws 12 watts while the 906 draws 8 watts, meaning the two bulb types are not electrically equivalent and are not interchangeable between the 1984-1985 and 1986-1988 model years.
Both the 906 and 561 carry ANSI designations valid in the United States and Canada, indicating conformance to a shared North American standardization for bulb geometry and electrical ratings.