GMC M340 Brake Bulb Size
The GMC M340 brake light requires bulb size 1073 or 1129 depending on the specific configuration of the vehicle. Data for the provided specifications 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 | 1073 |
| 1955 | 1129 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W. | 1073 |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W. | 1129 |