Jim Carter is working on having some new wheels made. 8 lug, 15" one piece with the correct backspacing for the AD truck. Problem is that the wheels of progress turn slowly when you're dealing with Taiwan and US import laws. 6 months ago I was informed of this, and was told it could take 6 months to 2 years before he has them.
As for finding 8 lug wheels, go to your local truck salvage. Ford, GM and Dodge used the same bolt pattern, GM used a smaller hub. On the front the larger hub size won't make a difference on a GM. On the rear it will, because the hub needs a close fit around the axle hub to carry the load.
There are two other issues that you need to address. Backspacing and wheel width. Measure from the edge of the rim to the inner hub face (on the back of the wheel) to get the correct spacing. If it is too deep, the wheel won't clear the tie rod ends. The other issue is rim width. It's tough to find the older, narrower rims.
If you're running original hubcaps, you will need to transfer your clips to the newer wheels. All of the older caps have the same internal diameter for the hubcaps, but they don't all use the same clips. And they don't make new clips for the 3/4 ton.
