By those tire sizes and the pics I would guess the fronts are 8" and the rears are 9". My tires are 245/35/20 and 275/30/20 and I have had them on 8.5/10 and 8.5/9.5 and they are stretched more than that.

 

Your ride is freaking sick! I showed my wife the pics and she loves it. She went outside and started washing ours! So you're saying they would look/fit good???? My car isn't dropped and probably won't ever be.

 

I know they come in 19x8.5+38 and 19x9.5+38, looking at the pics and what you said, I say both are +38 offset. The front offset is good, but the rears are a bit on the aggressive side and will stick out a little bit. The tire sizes you posted tell us that they are a staggered setup, the rears are wider than the fronts. 8.5 in the front and 9.5 in the rear. As long as you don't have a g35X you should be good.

Oh yeah, this should give you a very good idea on how they will look on the stock suspension:
https://g35driver.com/forums/showthr...ghlight=garnet

 

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If so thank you.

 

The rears will stick out a tiny bit on the stock suspension. If you lower it they will tuck. As you can see from those pics in ^^thread your car will look 100X better if you lower it.