The big issue is backspacing, so you don't knock the wheel weights off on the steering linkage. I found a set of white "appliance" wheels in Les Schwab's discontinued stock that fit the bill.
Product code: 03370885
Description: 34676ZR 16.5x6.75 (8 on 6.5) Superior type 34 white 8 spoke (rwd)
Price: $19.90 each
Please note that this was a discontinued item, so I may have grabbed the last of them. The wheels are wider than the stock split rims; I had to roll the fenders to clear the tires, especially on the rear. The fronts do not rub the frame or inner fenderwell even at full turn, and they clear the steering knuckles nicely. Aesthetically, they don't match the truck other than the color (I have a white grille and bumpers).
I chose to match the origial tire height as closely as possible (to keep up with slow moving buildings), so I went with a set of 35/1250R-16.5/8 radials. They're huge, and you will have tire clearance issues on the rear if you use these. If you are changing the rear gears, you can select any tire you like.
The previous owner of my rig had put ugly chrome 8-lug mags on the truck and it steered horribly (not to mention the washers used to correct the backspacing made it unsafe at any speed). By going from a 10" to 8" wide tire, I eliminated the need to install power steering. I still have the 1-ton springs under it, so going to tall rubber made a noticable improvement in ride.
Hope this helps. Good luck.
