wheel fitment?
 

Will these sizes and offsets fit nicely on the 370Z ? or any spacers or other things needed... mostly sticking to stock springs and suspension, cant really lower my car. Rims were on a G37.

20 x 9.5
20 x 10.5

35 & 37 offsets
245/35/20
285/30/20

Those wheels will fit close to stock in the rear and a little more aggressive than stock in the front. I'd personally throw on some spacers, but that's just me.

spacers?
 

so 15mm to 20mm spacers in the rear and 10-15mm in the front?

Personally id prefer not to have spacers like i did in my S2000.

I think on stock the front will be OK. I think +30 is a "recommended" offset. The rears will need spacers. +15 to +20 offset for the rear is reasonable.

sounds good, except for the rear spacers