Hey, I'm running threw a dilemma, I have a 18x8.5+42 (im planning to use spacers) wheel that I'm trying to get to fit into the back of my G35 Sedan. I've been thinking about 205/40/18 for a nice stretch look but I have a large fender gap still. I'm dropped on coils, I could drop it some more but my car will just hit the floor. Any suggestions on getting my car stretched&flush? I was reading threw I saw someone had a 235/35/18 tire on a 9.5 (rimtuck.com) what would the same size be but for a 8.5?

I plan to buy wider and lower offset wheels when the time is right, but right now college is eating up my wallet. And I am in need of a tire change so I might as well kill two birds with one stone.