Why won't upper ball joint removal socket work?

I don't think I have seen a reference to what I am about to ask. Just because you have a 73 Dart, that does not 100% mean you have a 73 A Body front suspension. At some point in time a previous owner could have had a problem and wound up getting front end parts from a 69 Barracuda. As long as you replace the right parts, they would fit. Could you please provide an accurate measurement of the ball joint side-to-side? That will determine what you need. If it is the size I have, I'll mail you mine as a loaner. When you are done, mail it back.