For the 2001 Volkswagen Passat, the low-beam headlight uses a D2S bulb, while the high beam uses 9003. The supplied fitment data does not specify an additional headlight-type variation, so verify the original bulb before ordering.
Fog-light fitment varies by production period: early models use 9003, while late models use H3 or H3C. Several exterior lamps also change between early and late models. Early-model parking and center-stop lights may use 2825 or 98, while late-model parking lights use 3457A and the center stop is listed as LED.
For the rear lighting, early models list 7528 for the tail and rear turn signal, while late models use 7225 for the tail light and 7507 for the rear turn signal. The reverse light uses 7506. Brake-light options include 7506R, 7528, or late-model 7225; compare the original bulb where noted.