Upload & Sell: Off
My first lights were Novatron with similar heads. I wound up buying a universal type soft box that used a mount similar to this: http://j.mp/1cOwG5W It worked, but due to the contoured shape of the head it could move around if not quite secure.
The beauty dish, would probably have to be home made, even then with that style of head (built in reflector) it would probably not produce the appropriate output...
If I were in your position, I would pick up at least one new/used 2103 head to expand your options.