For the 2000 Chevrolet Impala, the supplied fitment data lists a 9005 bulb for the high-beam headlight. No low-beam bulb is specified in the available data, so verify the low-beam socket on the vehicle before ordering. The daytime running lights also use 9005 bulbs, while the fog lights use 893 bulbs.
Front turn signals and parking lights use 3457A bulbs. The front and rear side markers are listed as 194NA. At the rear, the brake and tail lights use 3057R bulbs, while the rear turn signals use 3057 bulbs. The reverse lights use 921 bulbs, and the center stop lamp is listed as LED rather than a replaceable bulb size.
Interior and auxiliary applications include a 578 dome-light bulb, a 912 trunk-light bulb, and 194 or 7441 options for the ash, courtesy, glove-box, and map lights. The license-plate lighting is also listed with 194 or 7441 options. Confirm the existing bulb and socket where multiple fitments are shown.