I got a peice of plastic block from a local plastics company (same stuff cutting boards are made of) and shaped it with a dremel to get it close to specs. I then send the dimensions to
www.vdubcustoms.com to get the adapters machined out of aluminum. I then measured and drilled the bolt holes to match the calipers and mount them on the spindle.
This job was custom in every way so I don't have any dimensions to give out.
Sandeep