you can use the cheap ones we run them on my friends drag car and there are no shakes we just put the heavy side of the spacer opposite the heavy side of the tire we have run them up to 145mph no problem and he was running 4:11's
I also used some on my pick-up no problem and I have had it bouncing all four tires off the ground going up hill
your best bet is a machine shop and have them made but I don't see how they are safer the bolt on ones if they fail you lose a wheel the other ones I really don't see how they could fail
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