I don't have the sport package but I recently purchased the Sport package brakes from Motoextreme. When I get the brakes on the car my base/steel spare will no longer fit (too small to clear the bigger brakes) so Adam was kind enough to include his Sport pacakge spare in the deal (he's got a subwoofer where his spare used to be).
So, I just went out to the garage and compared the fit of a conical (regular/aftermarket) lug nut with a Nissan washer style lugnut on the Enkei spare. It looks like you could get by with using the conical lugs in a pinch, like a short drive to the nearest tire shop (all the spare should be used for anyway), but I wouldn't recommend it. The washer style lugs definitely provide a far more secure fit for the rim design.
Good thinking AK to carry 5 of the washer style lugs in the Z for the spare if you're running aftermarket rims.
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