PowerSteering

Yup, 65 Dartman is on the right track: you are shopping in the wrong places. RockAuto sent you what, a piece of junk ruined by Cardone? And some rando on Amazon, yeah, that's not gonna work. Get with RedHead steering (there in WA state), Steer & Gear, and/or Firm Feel to get the right parts in quality worth your time and effort.
This is the answer. Unless you don't mind non stock, you can use the superior Saginaw pump, but it will require the brackets to mount it.