You have to get the right offset as well. Not sure what the stock rim offset is. Contact your infiniti parts dealer and ask.
You just need to find the size of the rim and width, offset, and bolt pattern. If you want to go for styling you can go for an ever bigger/wider/lower offset rim. But you are going to have to do some calculations to make sure the total diameter of the tire doesn't exceed the oem one or your speedo will be inaccurate.