2001 Land Rover Discovery bulb fitment uses a 9003 bulb for both the low-beam and high-beam headlights. This shared bulb size applies to the listed headlight fitment; check the existing bulb and housing before ordering if your vehicle has replacement or non-original lighting components.
The fog lights use H1 bulbs. Exterior lighting includes 7506 bulbs for the rear turn signals, reverse lights, and center stop light. Front turn signals may use either 7506 or 2825 bulbs, so confirm the bulb currently installed before replacement.
- Brake and tail lights: 7528
- Front parking lights, front side markers, and courtesy lights: 2825
- Rear side markers: 5007
- License plate and glove box lights: 6418
- Dome and map lights: 6461
- Trunk light: 5008
For the main headlights, replace the low- and high-beam bulbs with matching 9003 units. Verify the socket and bulb markings whenever a previous lighting conversion or aftermarket assembly may be present.