For the 2021 Honda Civic, the low-beam headlight uses an H11 bulb, while the high beam uses a 9005. The supplied fitment data does not specify separate applications by projector or non-projector headlight type, so confirm the existing bulb and housing before ordering.
Front fog lights use an H8 LED bulb. The front and rear turn signals use amber 7440A bulbs. Brake lights and the center stop light use 7440 bulbs. Several exterior functions are listed as integrated LED applications, including the daytime running lights, license plate lights, parking lights, rear side markers, and tail lights.
The front side marker uses a 2821 bulb. Interior fitments include 168 or 194 bulbs for the dome, map, and trunk lights, while the vanity light uses a 37. No reverse-light bulb fitment is provided in the supplied data.