Ball joints:how much should i be paying?

I am a bit confused here. They have a kit for dodge rwd 59-89 or Wutever. Then theres a kit for 65-73 drum brake only. The 1st one can b drum too. Which would I need to buy for my 70 dart with drum brakes? I really need one of these kits so would someone help me out??

http://www.p-s-t.com/pc-1803-156-dodge-rwd-1957-89.aspx

There's the link