Hi Robert,
I am going to pull the wheels off again and get a couple measurements. I am pretty sure that they are 3/4". I need to make a measurement of the hub length. I've already heard that there could be issues there and although I could make them work, I would rather have something that is a direct fit.
As for the rim width, I am shooting to run a 20x10x8 wheel on it. So I am shooting between 8-10" wide wheel.
Thanks for shooting me a message. I am going to try looking at a couple more local yards, but will be in touch sooner than later. -Adam