get a piece of angle iron around 30-32" long. Lay it over the tabs, then go underneath and mark the hole location into the the angle iron. Drill those two holes (to bolt to the tabs) along with 4 more for your lights.
The only issue you will have is the tabs have too much metal in front of the holes. You will most likely have to cut 1/2" or more off the tab. It will be self evident when you set the angle iron on it. If thats not pratical you could bolt the angle iron underneath, but it might look bad.
2004 Ford Ranger Sonic Blue 4dr 4x4 4.0 Manual