I don't know the offsets? but I'm guessing the would be high 30's med 40's , as you can see most of the cars the have tested the rims on are fwd, except for the last rims . When it comes to having a good looking ke70 you need to fill the guards and that requires lower Rwd offsets around close to +-0 on a 7inch rims. so enquire what offsets they come in and take it from there.
Edit: Offset explained http://en.wikipedia.org/wiki/Offset_%28wheel%29