Even that you said that you tried, the best thing is to use a tire calculator online. That way your speedo won't be too much off. The other way would be to see if you find someone that have switch to a different size of tire and see if you like it.
Most of the time once you change the OEM tires sizes the speedo will have a very small % off.
Anyway, how wide are the base rims?
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2009 370Z MB Base w/Sport Package 6MT
Modshack's Custom Air Intakes /3M Clear Bra/ Illuminated Kick Plates / F. I CBE w/12" resonators / EVO-R Front Lip / Rear Hatch Wing / Tein S-Tech Springs /Ilegal Tint in the Rep. of VA/4x20mm Z1 Spacers/ Vinyl Roof/ Liquid Carbon Designs
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