Jake

First, try for details here
http://lists.topica.com/lists/usaca

To upgrade, you need to redo your mast base to accomodate the exit sheeves and the cleats for the diamond tensioner.

People also add some positve rotator ears if they want and certainly add a new deck sweeper rotation arm.

This is the prefered location for a veloctoek or compass.

You can get carbon plate from Hall spars or the link tami gave.

A cheaper solution is to take fiberglass G10 and vacumn bag carbon layers top and bottom to get the proper thickness, cut and finish to suit.

The hard piece to find or fabricate is the U shaped strap which wraps around the mast and attaches to the diamonds.

Mark