GMC K25 Suburban Courtesy Bulb Size
The GMC K25 Suburban courtesy bulb utilizes 3 distinct sizes: 105, 211-2, and 1156. The replacement chart covers vehicle production spanning 1969 to 1978.
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 |
|---|---|
| 1974-1978 | 105 |
| 1970-1972 | 211-2 |
| 1969 | 1156 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 13W. | 105 |
| ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W. | 211-2 |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. | 1156 |