A company called Style & Performance in Italy makes replacement CNC machined fork bottoms that replace the RC's and allow radial calipers to be fitted.
They can anodise them in any colour too. I have a set and they're a work of art. Still not fitted them though - using
www.rc51parts.com radial adaptors for now...
Here's the link if anybody wants to see the fork bottoms from S&S:
http://www.styleandperformance.it/index ... 71&lang=en