<font face='Comic Sans MS'>I can't quite get oriented to the pictures location and where on the frame rail that is.
It does appear to me however, to be just aft of where the front cross member and radiator support are welded to the frame rail. If that is the case, there is an oblong hole on the bottom of the outer rail in that location, which incorporates a doubler welded to the inside of the rail. That doubler also has a somewhat smaller oblong hole. I'm guessing the oblong holes are there exclusively for drainage and air circulation when motoring on down the road.
I can't tell what the overall shape of that doubler is, but suspect it has something to do with reinforcing the two attach points for the bumper horn and the tubular outboad bumper support, all of which attach there as part of the sandwich. Plus, anything else the engineers determined needed to be tied together to form a ridgid assembly.
Those little scraps of metal at the spot weld points seem to be all that are left of the doubler.
Wish I could give you a source for an exploded view of that area.In any event, hope I've been of some help.</font id='Comic Sans MS'>
[Blocked Image: http://s4.tinypic.com/30w2jyw_th.jpg]