For the 2002 Nissan Xterra, both the low-beam and high-beam headlights use a 9007 bulb. This same bulb serves both headlight functions, so verify the existing bulb and connector before ordering.
Fog light fitment is listed as either H3 or H3C. Check the original fog bulb and socket to identify the correct option. The front turn signals use 3457A, while the rear turn signals use 3157A.
For rear lighting, the brake and tail lights use 3057R. The center stop light uses 912, and the reverse lights use 921. License plate and map lights may use either 168 or 917.
Parking light fitment requires comparison with the original bulb: listed options are 168 or 917 under Option 1, or 3457A under Option 2. The front side marker uses 168NA, and the dome light uses DE3175.