They are 9006 bulbs - can be accessed via the 2 little removable panels at the front of each wheel,
however, if you are fitting HID's, I would recommend you remove the wheel and the lower front wheel well panel one side at a time ( 4-5 10mm plastic nuts, one torx screw, #26 I think ).
You have to remove the belly pan to access the 2 lower 10mm nuts on each side.

( I took that opportunity to also remove the entire bumper cover so I could do some cleanup in the front area, not much harder, just a few more screws and nuts after removing the wheel panel. You do, however, have to raise both sides and support on jack stands .... )
If you do this - don't forget the temperature probe.