What brake line set should I buy 71 or 73

Thank,s for your help.now are the prop valves. The same from power to Manuel on the 73 duster if not can some one show me pics of the two so I know what one to use ?

I agree with moparisbest, prop valve are the same between manual and power. Look at this site for prop valves:
http://inlinetube.com/Prop Valves/pro_valves.htm