GMC M340 Instrument Panel Bulb Size
The GMC M340 instrument panel requires bulb size 57 or bulb size 1896 depending on the specific application. Data for the bulb sizes covers the range from 1955 to 1956.
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 | 57 |
| 1955 | 1896 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 1W. | 57 |
| ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 0.9W. | 1896 |