GMC K2500 Suburban Dome Light Bulb Size

Additional Notes

• The GMC K2500 Suburban uses the 211-2 bulb size for the dome light across all model years listed in the specifications, spanning 1979-1992 and 1993-1999.
• The 211-2 is a festoon-type bulb, meaning it mounts by pressing horizontally between two spring clips rather than inserting into a socket.
• The 211-2 bulb follows the ANSI standard, indicating it meets a defined set of performance and construction requirements recognized in both the United States and Canada.
• The bulb operates at 12 volts and 12 watts, which is consistent with standard automotive electrical systems.
• The 211-2 carries an SV8.5 base designation, which refers to the festoon cap width of 8.5mm at each end of the bulb.
• The 211-2 bulb has a 41mm length, which is the span between the two end caps and determines physical fitment within the dome light housing.
• Festoon bulbs of different lengths are not interchangeable even when voltage and wattage ratings match, as the physical length must correspond to the fixture's clip spacing.
• The 211-2 designation is a standardized trade number, meaning bulbs sold under this number by different manufacturers share the same electrical and physical specifications.