GMC K35 Dome Light Bulb Size

Additional Notes

• The 211-2 is the sole bulb type listed across all dome light entries for the GMC K35, appearing in every model year covered by the specifications.
• The 211-2 is an ANSI-standardized bulb, meaning it conforms to a defined set of electrical and physical parameters recognized across the United States and Canada.
• It is a festoon-style bulb, a form factor characterized by a cylindrical lamp body with metal end caps that make contact with spring-loaded holders rather than a screw or bayonet base.
• The 211-2 has a specified length of 41mm, which is a critical fitment factor since festoon bulbs must physically span the distance between the two contact points of the dome light housing.
• The base type is SV8.5, a designation that refers to the 8.5mm width of the end caps on the festoon body, and a housing designed for a different festoon width would not retain the bulb correctly.
• The bulb operates at 12 volts, consistent with the standard electrical system voltage of conventional automotive platforms.
• The rated wattage is 12W, which reflects the power draw of the original incandescent filament design.
• The GMC K35 uses the 211-2 across the 1973-1974 and 1977-1978 model years, as well as 1968, indicating a consistent dome light socket specification over a long production span.
• Because the 211-2 is an ANSI-defined standard, replacement bulbs from different manufacturers carrying the same designation are expected to share the same voltage, wattage, length, and base type, supporting cross-brand interchangeability.
• Any festoon replacement bulb of a different length, such as the common 36mm or 44mm variants, would not be a direct fit for the K35 dome light housing, as the 41mm span is specific to the 211-2 specification.