Rene,
There are numberous places in the Netherlands to get used parts from...Have you tried Mark van den Brand, checked the adverts in the Saturday Telegraaf, asked for parts on
www.onderdelenlijn.nl or
www.mbatc.de? 700USD iS WAY too expensive for those parts...700 Dutch guilders is even too much!
It might even be possible that we have used (or even new) callipers for the /8 lying around...
good luck and greetingz,