GMC Topkick Brake Bulb Size
GMC Topkick brake bulb size 1157 represents the bulb specification for this medium-duty truck model across its production span. The replacement chart covers 1990 to 2001 model years with corresponding bulb size data.
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 |
|---|---|
| 1990-2001 | 1157 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W. | 1157 |