You can fab a pair of axles from VW or Porsche parts. There's a regular on "the510realm", Matt, that produces aluminum adapter flanges to interface the VW/Porsche CVs to Datsun 4-bolt flanges.
With the recent tragic passing of Todd Walrich, I wouldn't count on the Wolf Creek kits being available too much longer....I don't have any insider knowledge, just reading the tea leaves. Other's may have more info on WCR product availability.