Hi GL03,
try them probably: http://www.braketechsolutions.com/BTSV101/Index.php
Anwar from Braketechsolutions is currently trying to knit together a dual Power brake-master cylinder combination (all drums) for my 1956 Special. Not having the results in hand, yet, I do not know, whether to recommend him. But from email-conversation so far, he sounds as if he knows what he is talking about...
Good luck !
Maikl
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