Well, on e-bay I found a company selling new, unused Delco starters for the A4. Spoke with them on the phone, and these starters are listed as replacements for #1107679. That number matches the Delco # on Robert Hess's site.
http://www.cncphotoalbum.com/atomic4/atomic4specs.htm
There are more available: the e-bay item # is: 120691637753 Cost is $159.95 + shipping.
Hope that is useful to someone!
-Marty