Not sure you have to do some calculations. Since stock is what 6 inch and 0 offset... Well they sell Honda adapters maybe that will be easier for you.
Edit: the spacers you would have to run would be about a inch tick so those rims won't be good for a Z.
You should first lower ur car then mount the flares the way you think they look good. I think the rims he has are 17's and they also much wider than yours so the flares are much higher. Plus it depends on how low the car is going to be.
-Jt
WoW= Crack
You just can't have enough of it. Btw there are plenty of things you can do after you reach lvl 70. The game is endless, the good thing is that I stopped playing it. I maybe only log in for 4 hrs......... once a week lol