what the hell is going on with you guys getting vibrations from spacers, not just the OP but others. If they have hubcentric rings or built in rings you should get nothing of the sort. I ran rear spacers of 3 different sizes, twice with no hubcentric rings and I never ever got vibrations. Adding spacers would not cause your Z to be out of alignment either.
You dont really need hubcentric rings unless you plan on going over 120 mph on a regular basis, its just recommended you have them to be safe...and I do recommend them.
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