GM decided around 2000 that all the cars didn't need door lights anymore. If you choose that you want them and are willing to do some work, you can have them.
I added them back into my 2000 Regal. Got the wiring from an earlier model, ran it through the factory door connector and tapped into the interior light circuit by the door sill plate.
If you go this far... maybe you want to add puddle lights as well? I did.
Now i know why my 02 GP GT doesnt have those lights