Would these wheels fit?
#16
This is the calculator that I use. Very helpful when messing about with odd sized wheels!:
http://www.1010tires.com/WheelOffsetCalculator.asp
http://www.1010tires.com/WheelOffsetCalculator.asp
#17
#19
agreed - rolling diameter is the crucial factor, but all three threads were talking about 18 inch rims and that seems to be the way people are going. And OP was asking about 18 inch so didn't want to confuse the issue