For the 2000 Land Rover Discovery, both the low-beam and high-beam headlights use a 9003 bulb. The supplied fitment data does not indicate a projector or non-projector headlight variation, so verify the installed housing before ordering if the vehicle has replacement or modified lamps.
The fog lights use H1 bulbs. Front turn-signal fitment includes both 7506 and 2825 options, so confirm which lamp position and housing your Discovery uses. Rear turn signals and reverse lights use 7506 bulbs, while the brake and tail lights use 7528. The center stop light also uses 7506.
Other exterior applications include 6418 for the license-plate lights, 2825 for the parking lights and front side markers, and 5007 for the rear side markers. Interior fitment includes 2825 for the courtesy light, 6461 for the dome and map lights, 6418 for the glove-box light, and 5008 for the trunk light.