Here is the factory set up. evintho is correct, expect to pay at least $2,000 - $2,500 for a complete factory unit, not to mention they are very hard to find. But on the other hand, they are well worth it if you do!
You know, rather than the Chinese knocking off carburetors, why do't they knock off a complete original style power steering unis, for 52' and later Mercury's and Fords?