For the 2001 Honda Prelude, both the low-beam and high-beam headlights use H1 bulbs. The supplied fitment data does not identify a projector or non-projector headlight variation, so confirm the existing bulb and housing before ordering.
Front and rear turn signals use 7440 bulbs, while the reverse lights also use 7440. Brake and tail-light applications use 7443R, with additional tail-light listings for 168 and 917 bulbs. The center stop light uses a 7440.
For smaller exterior lighting, the front and rear side markers use amber-tinted 168NA bulbs. Parking and license-plate lights are listed with either 168 or 917 bulbs, so compare the original bulb where access or socket design differs. Interior applications include DE3022 for the courtesy light, 2825 or 98 for dome and map lights, and 2721 for the instrument panel and automatic-lighting application. The ash light is listed as either 2721 or 74; compare it with the original bulb before replacement.