Ford F-550 Super Duty Reading Light Bulb Size
The Ford F-550 Super Duty reading light uses a 578 bulb size for this component. The replacement chart covers vehicle production spanning 2017 to 2019.
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 |
|---|---|
| 2017-2019 | 578 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W. | 578 |