GMC K25 Courtesy Bulb Size
GMC K25 courtesy bulb specifications include 105, 90, and 211-2 sizes for replacement applications. The replacement chart covers 1969 through 1978 vehicle production years with corresponding bulb size data.
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 |
|---|---|
| 1976-1978 | 105 |
| 1975 | 90 |
| 1974 | 105 |
| 1970-1972 | 211-2 |
| 1969 | 105 |
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). Single-filament bulb with BA15s bayonet base. 12V, 13W. | 90 |
| ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W. | 211-2 |