Hola, Tío
As long as I know, argentines A-4C has come as 25 decocooned cellules from the Arizona desert. Only argentine A-4C´s has those reinforcements over the wings (not even the A-4L were modified that way..). I think that they were modified here to have spoilers also. If they would bought the A-4F wings.. why they would bought A-4C´s instead of complete A-4F airplanes?