old soldier

1974 F785. Sent my steering wheel for restoration.  I would like to put a junk steering wheel in its place so that I can move it around as necessary.  Are the splines unique, or will any Mack steering wheel work?  Thank you.

1974 Mack F785.  I am investigating the best route to retrofitting power steering on the old truck.  The question is:  was power steering available back then such that I could find (maybe) a junk truck that is equipped with power steering and obtain the parts (or at least understand what I am going to have to buy to get it done), or does that air assist work well enough to rely on?

Thank you very much.

I have recently purchased a F785 from 1974.  I have no manuals, parts, operator's, maintenance.  Any assistance would be appreciated as I have as yet been unable to locate any using the internet.  Thank you.