GMC 370 Turn Signal Bulb Size
GMC 370 front and rear turn signal bulbs utilize 1156, 1073, and 1129 bulb sizes across different model configurations. The replacement chart covers 1951 through 1959 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Front Turn Signal
If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.
| Years | US Type | EU Type | Shop |
|---|---|---|---|
| 1959 | 1156 | P21W | Check Price |
| 1956-1958 | 1073 | 1073 | Check Price |
| 1951-1955 | 1129 | 1129 | Check Price |
Rear Turn Signal
| Years | Bulb Type | Shop |
|---|---|---|
| 1959 | 1034 | Check Price |
| 1956-1958 | 1073 | Check Price |
| 1951-1955 | 1129 | Check Price |
Bulb Specifications
| Description | Type | Shop |
|---|---|---|
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. | 1156 | Check Price |
| ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W. | P21W | Check Price |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W. | 1073 | Check Price |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W. | 1129 | Check Price |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W. | 1034 | Check Price |