GMC K2500 Dome Light Bulb Size

The GMC K2500 dome light requires a 211-2 bulb size for interior illumination across all listed vehicle applications. Available information covers the specific time range from 1979 through 2000 for the provided data points.

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 K2500 dome light uses the 211-2 bulb across all listed model years from 1979 to 2000, with the sole 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 lengthwise between two spring clips rather than inserting into a socket.
The 211-2 carries an ANSI designation, indicating it meets a standardized specification recognized in both the United States and Canada.
The bulb operates at 12 volts and consumes 12 watts, which is consistent with standard automotive electrical systems.
The 211-2 uses an SV8.5 base, a designation that refers to the festoon contact cap width of 8.5mm at each end of the bulb.
The bulb has a length of 41mm, a physical attribute that determines whether it seats correctly within the dome light housing of the GMC K2500.
Festoon bulbs of similar length but different base widths are not interchangeable with the 211-2, as an incorrect base width will result in poor contact or failure to seat within the fixture.
The 211-2 designation is shared with other vehicles across various makes and models, which means the bulb is widely available as a general-market replacement part rather than a vehicle-specific component.