Using a Late Steering Box in a ’72 Car

This is a spin off from another thread I posted, but I figured I'd get a better response with a new topic...

What do I need to make a power steering box from a 1973 Duster work in a 1972 Swinger with power steering?
None of the parts stores can get a pre 73 box, and I've already got a new 73 box in the shop.
Thanks again,
Jon
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