I rebuilt this exact style Corvette power steering system on my black 69 Corvette back in the early 2000's
This style of double valve power steering was actually used on all 1963-1982 Corvettes.
Here are some links to a couple Corvette companies where you could order all new (or rebuilt) Corvette steering components to make this mod:
http://www.ecklerscorvette.com/steering.html
http://www.mamotorworks.com/Corvette/ca ... ring-parts
I might do this on my red Patrol, and if/when I do, I will capture all the part numbers, etc that I use...