What I would love is to hear from someone who's actually installed these.
I've contimplated using these, but am a little hesitant.
I don't think the problem is the nuts not setaing, like the other guy said, it's a full ring, there won't be any gaps, the problem is the basic design of the whole thing. The spindle to knuckle joint is a press fit. The bolts just hold it there, there is only supposed to be minimal stress and load on them, friction from the press fit takes most of the load. If you space out the spindle, even 1mm, the press fit is that much less effective and the poor old studs and nuts are now doing a job they were not designed for.
Mabey these old axles had so much press, it's not a problem. The problem is, we don't know. Hence, if someone has installed these, and has had them on for a while, preferable some time off-road, let us hear from you!