Wilwood conversion problem

I stand corrected, my memory has that missing dim in the drawing. It would appear that not all of their dwgs do have it when they should.

Are Dr. Diff's also aluminum hubs? Stress management is much more important in aluminum than it is in iron or steel. I haven't been a wilwood employee for ~12 years, but I would strongly advise against turning down that region of one of their hubs.