I spent a couple of hours with the search and didn't find anything on these rotors for the rear of 914-4s:
http://pg.photos.yahoo.com/ph/a51split/det...scd.jpg&.src=ph
http://pg.photos.yahoo.com/ph/a51split/det...scd.jpg&.src=ph
The hats are cast Al.
Anyone know who makes/sells them?