For the 2017 Ford Focus RS, the headlight bulb fitment depends on the installed headlight setup. The listed low-beam options are D3S and H11, while high-beam applications use D3S or H1. Confirm whether your vehicle has the corresponding headlight type before ordering, since these bulbs are not interchangeable.
The fog lights use H8 LED bulbs, and the daytime running lights use H1. Other useful exterior fitments include 168 for the parking lights and 2827 for the front side markers.
- Front turn signal: 7507 for hatchback models with HID headlights.
- Rear turn signal: 3757A on hatchbacks or 3157A on sedans.
- Brake and tail lights: 3157R.
- Reverse light: 921.
- Rear side marker: 194NA.
Check the vehicle configuration and existing bulb or housing before replacement, especially when selecting between the D3S/H1 and D3S/H11 headlight options.