For the 2001 Nissan Altima, both the low-beam and high-beam headlights use a 9007 bulb. The same 9007 fitment is also listed for the daytime running lights. No projector or non-projector headlight variation is specified in the supplied fitment data.
The fog lights use 881 bulbs. Front turn signals take 3457A, while the rear turn signals use 3156. Brake and tail lights are listed as 3157R, with 3157 specified for the parking and cornering lights. The front side markers use amber 194NA bulbs.
For the center stop light, compare the original bulb before ordering: the listed options are 921 or LED. Reverse lights use 921. License plate lighting may use either 168 or 917, so checking the installed bulb is recommended.
Interior fitments include DE3175 for the dome light, 658 for the glove box, 578 for the map light, and 158 for the trunk light.