| Sorry Phil, but the rotors are not an adaption. They were fitted to all of the Factory Ducati team bikes in 1993. That is why they are so rare. Look at any photos of the factory bikes from 1993 and they will either have carbon/carbon rotors (if it is a dry race) or these narrow-band rotors with a large offset (if it is raining).
The 3 spoke rotors that are in your photo are the standard Corsa rotors that were fitted to the Customer bikes but not the Factory team bikes.
Anyway, if you ever see a set, let me know
Brian | 
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