GMC C3500 Dome Light Bulb Size

The GMC C3500 dome light utilizes a 211-2 bulb size for interior illumination purposes. Available data covers a span of time starting from 1979 through 2000.

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
1988-2000	211-2
1979-1986	211-2

Bulb Specifications

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

Other Locations

Additional Notes

The GMC C3500 dome light uses the 211-2 bulb across all listed model years from 1979 to 2000, with the exception of 1987, which is not present in the specifications.
The 211-2 is a festoon-type bulb, meaning it is cylindrical in shape and mounts by pressing its end caps into spring clips rather than using a twist or plug-in socket.
The 211-2 bulb has a length of 41mm and uses an SV8.5 base, which refers to the 8.5mm width of the end caps on a festoon-style lamp.
The 211-2 operates at 12 volts and 12 watts, which is consistent with standard automotive interior lighting power levels.
The 211-2 carries ANSI standardization, meaning the specification is recognized across both the United States and Canada, and the bulb is produced to a defined standard rather than being a proprietary size.
Because the 211-2 is an ANSI-standardized festoon bulb, it is interchangeable with other bulbs sharing the same 41mm length and SV8.5 base designation, provided the voltage and wattage ratings are also compatible.
The SV8.5 base designation is specific to festoon bulbs and is not compatible with wedge-base or bayonet-base sockets, making socket type a critical factor in fitment.