I know what those are!!! My 53 has them too, except they are connected to three other parts. This main piece is the part that goes in front of the inner fenders and radiator below the hood latch. The grille sits above/in front of it. Those are the two pieces that slide in between the rad support and the inner fenders from infront. Their are two bolts that are close to each other that go into the rad support, the one end of your pieces get bolted right inbetween their. Make any sense? I'm trying to find a picture but can't seem to come up with one...