You mention that you have after-market 19" wheels ... but no hub rings. If all else fails, you may want to consider purchasing a set of hubcentric rings and then install the wheels with the rings in place and check for vibrations ... perhaps first with the spacers removed, and then with the spacers installed. Although not always necessary, the rings can help center the wheels during install. Also, I assume that you have the correct type of lug nuts for your wheels.
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