For the 2006 Honda S2000, the low-beam headlight uses a D2S bulb, while the high beam uses H1. The daytime-running-light fitment is also listed as H1. No projector or non-projector headlight variation is specified in the supplied fitment data, so confirm the existing bulb and housing before ordering.
Other useful exterior fitments include 7440 bulbs for the front and rear turn signals, plus the reverse lights. The parking lights and front side markers use 2827 bulbs. The license-plate lamp is listed with either 2825 or 98, indicating a fitment option that should be checked against the bulb currently installed.
The brake lights, center stop light, tail lights, and rear side markers are listed as LED rather than a replaceable bulb size. Interior lighting includes a DE3022 map-light bulb, while the trunk light is listed as either 168 or 917. This page covers the supplied 2006 S2000 fitment data; verify socket style and the original bulb where alternatives are shown.