Sorry for the late reply but back on line now.
I have a Fox fork which accepts a Post Mount brake or adaptor to which I want to fit a Magura Louise brake which is made to the old International Standard.
The adaptor would need to "join" these two standards, ideally for a 180mm rotor but a 160 or 203 would get the build finished and rolling.
The rear is fitted and tested (I.S. to I.S.). no problem.
Any help would be greatly appreciated.
Had a look through the draw, plenty of other way rounders obviously but none of these, though I have yet to find the bag of Hope adapters, which the correct one is more likely to be one of.