I bought a complete set of NOS Hella units for my '67S (less sealed beam headlights) for about $350 from Brian at EINMALIG a couple of years ago. Don't know if they have any more left but you might try them.
http://einmalig.com/
5455 Production Drive
Huntington Beach, CA 92649
Toll Free: (888) 777-6772
Phone: (714) 895-6567, Fax: (714) 894-7126
