I ordered new suspensions the day after I got my z. I don't have any vibrations with my spacers. I don't think h&r makes 20mm bolt ons. But you do need 20mm to clear the bolt.
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2010 k23
H&R sport springs / Spc rear camber arms / SSR SP1 / Berk cbe / Varis cf lip / Nismo S-Tune side skirts
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