GMC K25 Suburban Brake Bulb Size
The GMC K25 Suburban brake bulb utilizes 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 documents the brake bulb specifications for this model range.
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 |
|---|---|
| 1969-1978 | 198 |
| 1967-1968 | 1034 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 2W. | 198 |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W. | 1034 |