GMC K3500 Dome Light Bulb Size

The GMC K3500 dome light requires a 211-2 bulb size for proper illumination within the interior cabin area. Available data for the specified component covers the range 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 K3500 dome light uses the 211-2 bulb across all listed model years from 1979 to 2000.
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 bulb measures 41mm in length, which is the critical fitment factor for festoon bulbs, as the spring-clip housing must match this figure precisely.
It uses an SV8.5 base designation, which refers to the smooth, rounded metal caps at each end of the festoon body with an 8.5mm cap width.
The 211-2 operates at 12 volts and 12 watts, consistent with standard 12V automotive electrical systems.
The 211-2 conforms to ANSI standards recognized in both the United States and Canada, indicating a standardized specification rather than a proprietary one.
Because the 211-2 is an ANSI-standardized festoon bulb, replacement units from multiple manufacturers are generally interchangeable provided the 41mm length and SV8.5 base are matched.
Festoon bulbs of similar length but different base designations are not directly interchangeable with the 211-2, as cap width and contact design differ between base types.