Ok I know a lot of people are looking for rims as I am.. and everyone wants to know what offset they need to run.. I have found this site in the past and it has worked for me and it is pretty simple, just type in what you have and what you want.. and this will tell you how far out your future rims will be and tires you can run on them
rims and tires
Stock 18's
18x8 +43
18x9 +15
Stock 19's
19x9 +47
19x10 +30
Nismo 19's
F 19 x 9.5 +40
R 19 x 10.5 +23
So just measure the distance from your rim to the fender and this will fill in the rest.
Hope this is useful to at least one person.