9" drum to disc conversion confusion

In the past 5 years,I've converted 3 Mopars(9") to discs.
I got the Wilwood setup from Summit,comes complete and works great.
Sam
Here is a link for using 9" drum spindles and a 14" wheel.

http://www.wilwood.com/BrakeKits/BrakeKitSearch.aspx?year=1965&make=Dodge&model=Dart&option=9%22+Inch+Drum+Brake+Spindle&whl=14