255/40 is 27"
255/35 is 26"
305/30 is 26.2"
if you already have 40's for the fronts, you could always replace your rears with a taller tire too.
325/30 will get you up to 26.7" (which is oem tire height for 370z) and within 1/4" of those 40 fronts. Just some extra food for thought.
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