Using Stock Rims and Wheel Spacers
I think more info is better than not enough. This may be more information than needed, but it may answer some questions that typically come up about the differences between the 320/520/521 rims. The video help to show how/why the rims hit the calipers without the spacers. There is also info in them the spacers I used. You can buy wheel spacers at most auto parts stores.