Do you know the dimensions of that bolt? Length and thread pitch?
I would try a place that sells metric fasteners like Wurth or Zelenda. Zelenda machine and tools - are one of the largest metric fastener importers for the USA.
http://www.zelenda.com/
Most indi repair shops get their nuts and bolts (fasteners) from Wurth. But Wurth will not sell direct, they only sell to repair shops.
Or maybe even a mail order parts place like Pelican parts might be able to help you out.
http://www.pelicanparts.com/catalog/...th6-detail.htm
IF you could find out the size of that bolt... there is a huge metric fastener shop here where I live in BA... I am sure they would have the right bolt for you. Let me know in a PM.
Dackel