Just Another Wheel Question (FR500 question)

Right now on my mustang build sheet im waiting for the new "64w" wheels. I was web surfing last night and came across the FR500 wheels on partshopper. I saw they had a 18x9 but thats all I can find, and all the threds on this forum alk about spacing and stuff but i never saw anything on different sizes, plus other wheel websites only carry 18x9's. Can you buy these wheels in different sizes? Im thinking about just getting stock rims on my mustang call and change it, and put the 700 bucks towards aftermarket wheels, I think FR500's on a black mustang would look cool, with a polished lip onthe black rims. I dunno anyone got any pictures of this? I would like to put some 18x10's in the back maybe a 19x10 in the back and a 18/19x9 in front, what do you guys think?

another thing, I keep seeing 18x10, 18x10.5 etc for the 99-2004 mustangs thats why I am curious.

Thank you. Do you like the rims? I got the 18in Polish rims on my order sheet but I think monday im gonna call and change it to the stock rims, and just buy aftermarket, I wonder how the FR500's look on an all black mustang. Your white mustang looks killer too. sigh im already thinking about changing things >_<!!