Unfortunately i've read this after finding this-
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... K:MEWAX:IT
I have one on my bike at the moment.It uses the same short 130mm hope axle in a ti glide or bulb rear hub[possibly big 'un too :? ]
It needs a special frame bolt as well thats the devil to find.and an xxl long rear skewer
All in all this system is hard to find,expensive when and if you do find one.It's other version uses a c2 caliper on an extra long mount,using the same frame bolt and short axle
That version is also expensive. [i just sold a complete system of the C2 version caliper and it sold for £165]
It is also a barsteward to get in good condition,I dont really think its worth the effort,unless it drops in your lap in perfect or fully serviced condition
I'd look towards the A2Z approach :?