Don't forget to check on 14MM thread studs- - - -they're virtually identical diameter to 9/16"- - - -just use the corresponding lug nut to the stud. There are a bunch of modern trucks like my Ram 1500 that run 14MM studs. You could even step up to 5/8" studs if you're willing to drill the hub to the right diameter to get the stud splines to swage into place properly.
Barrel-type wheel bearings are as obsolete as a whalebone corset- - - -use whatever tapered roller or ball bearings you can find. If you're planning to run the truck loaded to its max gross weight, or way overloaded like they were used when they were new, if might make enough of a difference to need a barrel-shaped roller, but I really doubt it!
Jerry
