if it's a hub-centric wheel like our Z's you should not use spacers that do not have the centering lip. even if it's 5mm there's a taper on the center bore (wheel side) so the wheel will not sit correctly.
if it's aftermarket wheels using tapered lugs you can go 5mm usually; you want 10mm thread and use steel lugs in this case. do at your own risk.
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