GMC C15 Courtesy Bulb Size
The GMC C15 courtesy bulb specifications include 3 distinct sizes: 90, 105, and 211-2, with each bulb size corresponding to particular vehicle applications. The replacement chart covers 1969 through 1978 model years and details the bulb size requirements across the vehicle production range.
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 | 90 |
| 1975 | 105 |
| 1974 | 90 |
| 1969-1972 | 211-2 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W. | 90 |
| 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 |