Power Steering Questions

Ok guys, got the pump on the way from Andy, pulleys on the way from CVF, I’ll get lines made locally... that just leaves the box. I was looking and borgeson ( more than I wanted to spend but I only want to do it once...) an I saw it says 67 to 72.
I didn’t get a chance to measure pitman arm size, since I want to drive it until everything is here, but the pitman stud nut is on the bottom of the centerline. That’s large sector right?

So if I get the Borgeson box do I need a pitman arm as well?