2017 Mazda Mazda3 bulb fitment starts with an H11 low beam and 9005 high beam. The 9005 bulb is also listed for the daytime running lights. No headlight-type or projector-specific variation is provided in the supplied fitment data.
Other useful exterior bulb details include 7440A bulbs for the front and rear turn signals, while the brake and tail lights use 7443R bulbs. Reverse-light fitment depends on the body style:
- Hatchback: 7440 reverse bulb
- Sedan: 921 reverse bulb
The 2827 bulb is listed for both the parking lights and front side markers. Rear side markers use 7443A bulbs, and the license plate lights use 2825 bulbs. Inside the vehicle, both the dome and map lights use DE3175 bulbs. Confirm the body style before ordering the reverse-light bulb, and match each replacement to the listed position.