Only place I could find the Nankang XR-611 offered in the 235/60R15 size:

http://www.mytyres.co.uk/cgi-bin/rsh...n&typ=R-227464

The matching 195/60R14 for the fronts are fairly easy to locate.

Perhaps someone looking for tires might want to contact Nankang about importing a few of the 235/60R15s for interested D owners???