Just found some 10 degree. In case anyone else is looking (they aren't that easy to come by)...here are the folks who had them and seem pretty knowledgeable/helpful...

Pinion angle shims http://www.knowwhere2jeep.com/


1946 1.5-Ton Chevy Shorty Bus
In the Stovebolt Gallery
Tango's 1946 Chevy "Skoolie" Project
All my best --- Tango