Talk about timing. I just put mine back on two days ago. No pics for you....
The black bumper piece between the upper grill and lower metal bumper needs to come off. You'll remove lower bumper then remove mid bumper (the piece fogs are in).
Once that's off, you'll look at the back side and see there is an insert that can be pulled out. There's room in there to mount your ballasts. Mine are zip tied to the insert, so when you put it back together you see the zip tie that's holding the ballast on the inside of the bumper.
It should make sense once you get it apart and are looking at it.