GMC C15 Side Marker Bulb Size
The GMC C15 front side marker bulb uses either a 168 or 194 size bulb depending on the specific vehicle configuration. The replacement chart covers 1973 through 1978 production years and details the corresponding bulb sizes for each model year.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Front Side Marker
| Years | Bulb Size |
|---|---|
| 1974-1978 | 168 |
| 1973 | 194 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W. | 168 |
| ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W. | 194 |