What about this?
http://www.ebay.ca/itm/Aftermarket-Shimano-11-Speed-Freehub-Conversion-kit-fits-Zipp-188-V6-V7-hub-/171857469297?hash=item280380df71:g:WNEAAOSwECZUoEPS
http://www.clperformancetraining.com
http://www.pillasport.ca
http://www.ebay.ca/itm/Aftermarket-Shimano-11-Speed-Freehub-Conversion-kit-fits-Zipp-188-V6-V7-hub-/171857469297?hash=item280380df71:g:WNEAAOSwECZUoEPS
http://www.clperformancetraining.com
http://www.pillasport.ca