GMC G25 Brake Bulb Size
The GMC G25 brake bulb uses 2 distinct sizes: 198 and 1034, with each bulb size corresponding to specific vehicle applications. The replacement chart covers 1967 through 1978 production years and details which bulb size applies to each model year.
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 Type | Shop |
|---|---|---|
| 1969-1978 | 198 | Check Price |
| 1967-1968 | 1034 | Check Price |
Bulb Specifications
| Description | Type | Shop |
|---|---|---|
| ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 2W. | 198 | Check Price |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W. | 1034 | Check Price |