Does anybody know or has already installed the 04 tail lights to '99-'03 S?

 

YES. So do the headlights.

 

I think the headlights need a modification for the HID, right?

 

They are ugly

 

the tail lights and headlights need to be modified. the headlights the ballast needs to be moved but the tail lights have to have mounts rigged and taking a hammer to your inside tail light housing of the car and some wiring.