The problem is not with the newer wheels with the larger opening, it's the larger wheels having to be adapted for use with the 4.75 opening that are hub aligned. It appears nobody makes new rims for the 4.75.
A day without laughter is a day wasted- Charlie Chaplin When wrestling a grizzly bear, you have to keep at it until the bear gets tired, not when you get tired. 1948 Chevy 2-Ton