White/GMC WIS Turn Signal Bulb Size
The White/GMC WIS uses 1157 bulb size for both front and rear turn signal applications. Replacement chart data covers 1988 to 1991 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Front Turn Signal
| Years | Bulb Size |
|---|
| 1988-1991 | 1157 |
Rear Turn Signal
| Years | Bulb Size |
|---|
| 1988-1991 | 1157 |
Bulb Specifications
| Description |
Bulb Size |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W. | 1157 |