For the 2009 Nissan Xterra, the low-beam and high-beam headlights both use 9007 bulbs. This shared fitment means the same 9007 bulb type serves both headlight functions.
The fog light fitment is listed with two LED options: H11 LED and H16 LED. Verify the required fog-light bulb type before ordering, as the supplied fitment data lists both options. No headlight projector or non-projector distinction is specified for this model year.
Other useful exterior bulb sizes include 3457A for the front turn signals and parking lights, 3157R for the brake and tail lights, and 3156A for the rear turn signals. The reverse lights use 921 bulbs. Front side markers use 194NA, while rear side markers use 3157A.
The center stop light is listed as an integrated LED unit. For interior lighting, the dome, map, and trunk lights use DE3175 bulbs. License plate lighting may use either 168 or 917 bulbs, so check the existing bulb or socket when replacing them.