Thats the million dollar question? The problem is that these trucks only allow 4" of backspacing before the tire hits the tie rod ends. All of the Chevy 8-hole wheels fin on the hub, but suffer from tire clearance problems. Some have said that the 70's Ford 3/4 ton 16" wheels will work if you can find them, and there is a trailer tire manufacturer that makes a wheel that is close. If you want the stock caps, you have to install the clips to hold them in place. Those white spoke wheels that they sell everywhere will also work if you like the look. Stockton wheel will make a custom set as well as other company's that do that kind of work. I am still hunting for some, but am about to go custom or modify some myself. Good luck and let us know what you come up with.
Ralph