GMC PM251 Instrument Panel Bulb Size
The GMC PM251 instrument panel requires a unique bulb size 57 for proper illumination of the gauges. Data for the specified lighting components covers the range from 1956 to 1957.
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 |
|---|---|
| 1956-1957 | 57 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 1W. | 57 |