Nate beat me to it. The side mount radiator make it pretty difficult to get to the drivers side parking lamp. On mine, I ended up having to cut the wires and pull the grille off before I would get the parking lamps and headlight buckets out. Since I was doing a complete teardown anyway it wasn't a big deal.
Otherwise, you may just try to fit a closed end wrench or socket on there and try to twist it off and break the bolt. If it is a screw holding it in, you are in for a long night. :-/