Well I was informed of the following offsets for my sedan, its on 350z suspension so its dropped an inch.

I'm looking at the GT7s now.. but the ideal offset on 8.5 is +38...

http://www.rayswheels.co.jp/cgi-bin/...?modelName=GT7

If that chart, the only things available are for 19x8.5:36, and 42, but the ideal is +38

but for the rear 19x9.5, +45 is recommended and only available is:+40,+42,+49.. so what would be the best move?

 

In the front both +36 and +42 would work although +36 may be cutting it a little close depending on the tires. Go with the +42 to eliminate any guess work.

In the rear it's pretty much the same story. Go with +49 to eliminate any worry.

Good luck!

 

You could go with the higher offsets (+42 and +49) then use spacers to bring it back out just a tad.