are you tracking your car, Fairlady_Zeto? Or just wanting the square setup?
Camber plays a huge role in selecting the proper offset wheels/ pending the occasion.
As for me (mostly straight line acceleration) I choose to run minimal negative camber-so a 18x9+15 would poke almost 1/2" on my Z...also,the stagger built in these cars would require a 25mm spacer on rear to sit in the same relationship to fender as front.
A lot of variables.
Go to [official 370z wheel fitment guide] pics specs only & take a peek at what other members are running & their camber setups.
Hope this helps.
