Hi Steve,
You have to change the whole wheelset as well as the axles and brakes in order to use the magnetic clip system on Strida 1 and Strida 2.x
[url]Strida "2" owner needs our help! on Bikeforums - #8 by Amuro_Lee]
I think you can request those parts from Strida Europe 
http://www.stridaeurope.com/english/service.php?subpage=faq&faq=4
Regards,
Amuro