69 Dually, what wheels/lugnuts

[glowpowered]

I have a 69 Dually truck. I found 6 16" dually rims that are the same. They have the smaller 4 9/16" center and "rounded" centers, if you know what i mean. Are these the right thing? Also i put new wheel studs in the front as they were stripped out. It looked like the factory "castle" lugnuts were rough on the studs. When i got the truck it had 2 mismatched lugnuts on each wheel, so i will need new ones. What lugnuts do i need for front and rear? It looks like on the front, the center of the wheel does the centering. But, it looks different on the rear. the wheels that were on the rear had some type of collar in the holes. I guess the lugnuts center the wheel on the rear? what centers the inside rear?
Thank You, Luke