Not sure which Hawk you have. I have the 94" T-1 size. When I ordered it I also ordered wing tanks at the same time. They installed mounting dowels inside the wing and marked the outside with a small dimple for locating. Some of the dowels can been looking in the flap servo bay. The sad part and true to many workmanship issues the mounting points didn't line up with the tank mounting pylons. I also added some reinforcement to the dowels I could reach. Hope this was of some help.
K.O.