Just got my hands on a pair of adapters for 256 mm. rear discs for Syncro, fit S3/TT Quattro/R32 discs and calipers. They're not a shelf item but a prototype.
For you with CNC equipment, here's the drawings:
http://home.online.no/~vegaholu/cad/...er_bracket.pdf
http://home.online.no/~vegaholu/cad/...er_bracket.zip
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