Chevrolet K5 Blazer Courtesy Bulb Size
Chevrolet K5 Blazer courtesy bulb sizes include 1003, 1004, and 1156 bulb options across different model configurations. The replacement chart covers vehicle production years from 1975 to 1986 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.
Bulb Size by Year Range
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 |
|---|---|---|---|
| 1985-1986 | 1003 | 1003 | Check Price |
| 1984 | 1004 (With 2 Headlamps) | 1004 | Check Price |
| 1983 | 1003 (With 2 Headlamps) | 1003 | Check Price |
| 1980 | 1156 | P21W | Check Price |
| 1979 | 1003 | 1003 | Check Price |
| 1975-1978 | 105 | 105 | Check Price |
Bulb Specifications
| Description | Type | Shop |
|---|---|---|
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. | 1003 | Check Price |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W. | 1004 | Check Price |
| 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. Variant of 1156. 12V, 13W. | 105 | Check Price |