For the 2000 Toyota 4Runner, the low-beam and high-beam headlights both use a 9003 bulb. The supplied fitment data does not identify a separate projector or non-projector headlight variation, so verify the original bulb before ordering if the headlamp assembly has been changed.
Fog-light fitment may be listed as either H3 or H3C. Front and rear turn signals use 7440 bulbs, while the brake and tail lights use the red 7443R. The center stop light uses a 921 bulb.
Several smaller applications have alternate listings. The license plate, parking, and front side-marker lights use either 2825 or 98 bulbs. The dome and trunk lights use DE3175, the glove-box light uses 2721, and the map light uses 57. For the instrument panel, compare the original bulb carefully: the listed options are 158, 194, 7441, or 2721, with the data identifying these as separate original-bulb comparison options.