GMC G35 Dome Light Bulb Size

The GMC G35 dome light uses a 211-2 bulb size for interior illumination. The replacement chart covers vehicle production spanning 1973 to 1978.

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
1973-1978	211-2

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2

The GMC G35 uses the 211-2 bulb for the dome light across the 1973-1978 model years.
The 211-2 is an ANSI-standardized bulb, meaning it conforms to a defined specification recognized across the United States and Canada.
The 211-2 is a festoon-type bulb, which is a cylindrical lamp that mounts by pressing its two end caps into spring clips rather than inserting into a socket.
The bulb has a length of 41mm, which is a critical fitment factor, as festoon bulbs must physically span the distance between the two retaining clips in the fixture.
The 211-2 uses an SV8.5 base, a designation that refers to the 8.5mm cap width on each end of the festoon body.
The bulb operates at 12 volts and draws 12 watts, consistent with standard 12-volt automotive electrical systems.
Festoon bulbs of the same voltage and wattage but different lengths are not interchangeable, as a mismatched length will prevent proper contact with the fixture clips.