Junk Yard PS Conversion?

[Detour]

Bad shoulders and the short amount of driving I did in the truck last summer lead me to want PS. Even though I love the simplicity of the truck as it sits.

I see plenty of conversion kits on the thread and install threads. But when I look at RockAuto they show some of the PS pumps as the same part number from 67 through the 80s square bodies.

So I am curious, if I pull a steering box and PS pump out of a square body will it bolt up? Understand that I will need a different pulley and pitman.

Thanks guys.