For the 2017 Honda Fit, the low-beam and high-beam headlights both use a 9003 bulb. The same 9003 fitment is also listed for the daytime running lights, so choose a bulb designed for the correct lighting function when replacing these lamps.
The front turn signals and parking lights use 7444NA bulbs, while the front side markers use 168NA. At the rear, the turn signals use 7440 bulbs and the reverse lights also use 7440. The brake lights, center stop light, tail lights, and rear side markers are listed as LED rather than replaceable bulb sizes.
Interior and auxiliary fitments include 194 or 7441 bulbs for the dome and map lights. The license plate and trunk lights may use either 168 or 917 bulbs. An additional 2721 bulb is listed for the automatic-lighting application. No fog-light bulb fitment is provided in the supplied data.