Hi,

I also have a '46 1/2 ton. Got hit-and-run about 4 months ago which slightly bent my bumper and cracked the chrome off it. Fortunately we caught the guy and my bumper just got finished today. Anyway, I took some photos of my front bumper brackets for you. These are original equipment and the fenders and valance are steel - original to the truck. Hope these pics help you out. I took 5 pictures, wide and both brackets from the front and above. Let me know if you can't see them all.

http://s456.photobucket.com/user/blastenpene/media/46%20Chev/IMG_0001.jpg.html?sort=3&o=4

Good luck,

David