GMC 2500 Series Instrument Panel Bulb Size
The GMC 2500 Series instrument panel utilizes 161 and 57 bulb sizes for the internal lighting components across the various dashboard clusters. Data for the specific lighting requirements covers the period from 1960 through 1965.
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 |
|---|---|
| 1965 | 161 |
| 1962-1964 | 57 |
| 1961 | 161 |
| 1960 | 57 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 1W. | 161 |
| ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 1W. | 57 |