Dodge Dart Pitman Arm

Do you guys know where I can find the exact part number of a part for my 73 Dodge Dart Sport 340? I don't want to return orders and some online dealers only offer one pitman arm when I know there are 2 one for manual/power steering. I need Part #'s for the Pitman and Idler arm, I suppose I'll need to buy the bushing set for the Idler Arm as well.

Thanks