340 power steering pump?

I have been checking out NAPA and RockAuto for a rebuilt power steering pump. RockAuto lists specifically about the 340 application. Was there a difference between 340 pumps versus other engine applications? This application is for a 1970 340 Duster.

FWIW, the 70-71 Chrysler parts book shows the same pump for 318 & 340 A bodies. It also lists A bodies as having the "threaded hole pump shaft" style, while other bodies could have that or the "key slotted pump shaft" style.

I can post the parts book page if you think that would be of any help.

Your car should have the pressed on 3 spoke pulley with a Federal pump