For the 2009 Honda S2000, the low-beam headlights use D2S bulbs, while the high beams use H1 bulbs. The daytime running lights also use H1. The supplied fitment data does not identify a projector versus non-projector headlight variation, so confirm the existing bulb and housing before ordering.
Exterior lighting includes 7440 bulbs for the front and rear turn signals, plus 7440 bulbs for the reverse lights. The parking lights and front side markers use 2827 bulbs. Brake lights, the center stop light, the tail lights, and rear side markers are listed as LED rather than replaceable bulb sizes.
For smaller lights, the license plate illumination is listed with either 2825 or 98 bulbs, while the trunk light may use 168 or 917. The map light uses a DE3022 bulb. Check the installed bulb where more than one size is listed, particularly for the license plate and trunk lighting.