18*7.5?
Thats sissy girl size. Even Hondas can laugh and take a bigger wheel than that.
Heres a rule when choosing wheels for your S-chassis. W >= H/2your wheel needs to be as wide or wider than half of the height. But not everyone agrees with me on that, but still, 7.5" wide is wack. There are a few different faces for the 57 Pro. More backspacing to more lip probably.
Here is the size chart for GL57pro:
http://www.rayswheels.co.jp/cg...57PRO
If you are set on 18's, use 18x8.5-9.5, stagger if you want, not my style, but whatever:18x8.5 +2218x9 +22 (or +12 if you're slightly more hardcore)18x9.5 +30 (or +12 if you're hardcore)
If you want to go 17's;17x8 +1217x9 +12-+30 (there are like 4 choices)
choose wisely, GL's are not cheap and you don't want queer looking titanic / leonardo dicaprio wheels