For the 2015 Chevrolet Spark, the low-beam and high-beam headlights both use an H13 bulb. The same H13 fitment is also listed for the daytime running lights, making it the primary front-lighting bulb for this model year.
Fog-light fitment is listed as H11 LED, H16 LED, or H8 LED. Check the existing fog-light housing and connector before ordering, since the supplied fitment data identifies multiple options rather than one universal fog bulb.
Other useful exterior bulb sizes include 7444NA for the front turn signals, parking lights, and front side markers; 921 for the reverse lights; and 7443R for the brake and tail lights. Rear turn signals use 7443, while rear side markers use 7443A. The center stop light is LED.
Interior and utility lighting includes a DE3175 dome bulb, with 194 or 7441 listed for the trunk light. License-plate lighting uses either 2825 or 98.