For the 2021 Mazda Mazda6, both the low-beam and high-beam headlights use integrated LED lighting. The supplied fitment data does not list a replaceable halogen bulb size or indicate a projector/non-projector headlight variation, so verify the complete headlamp assembly before ordering a replacement.
Other exterior lighting is also listed as LED, including the front turn signals, daytime running lights, parking lights, front and rear side markers, tail lights, brake lights, center stop light, rear turn signals, reverse lights, and license plate lights. No fog-light fitment is provided.
For the interior, the dome light and map light use DE3175 bulbs. The trunk light is listed with two possible fitments: 194 and 7441. Check the existing trunk socket or compare the original bulb before purchasing, since the supplied data does not specify which trunk configuration applies to a particular vehicle.