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I looked for a bit to find a stock hose app for this. My 71 uses a 1998-02 Firebird pump and a Delphi box - both use O-rings.
Nothing I found on the web seemed to fit. I "built" a setup on Summit's website using AN fittings, would run about $75
I ended up having a hose made at a local shop, Action Hose in Albuquerque. They specialize in industrial stuff so this was childsplay.
I provided a pair of ends; one 16mm and the other 18mm from O'reilly's. This was mocked up first with a piece of fuel line
so the exact length and twist would be made. It ran about $55 all told including fittings and looks like it will last 50 years.
As you see it simply exits the box at a 90 degree angle, curves under the box and with another 90 degree into the box
Power steering hose 
