Part Identification and Parts Website

Ok, so classic industries is going to take a very long time to send the power steering pressure line. It is out of stock. Auto zone does not have one.
This pressure line has a section on either end that is steel (photos above). Is there any reason I cannot replace this line with one that is entirely rubber tube? Can I buy these end fittings, the nut with the hole (what are these called?) and cut rubber tube to length, then crimp those things on?

Autozone sells the same high temperature tubing with the same diameter. I'd just have to cut it to length. These nut things looks like 1/2 inch.

It's not a pinion nut...