Buick Roadmaster Turn Signal Indicator Bulb Size
The Buick Roadmaster turn signal indicator requires bulb size 57 or PC74 depending on the specific application. Data for the bulb sizes covers the range from 1958 to 1991.
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 |
|---|---|
| 1991 | PC74 |
| 1958 | 57 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Miniature wedge bulb (T5) with printed circuit board twist-lock socket, for instrument clusters. 12V, 1.4W. | PC74 |
| ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 1W. | 57 |