Ball joint replacement questions.

I need to replace the upper and lower ball joints on my '67 Dart. Never done this before and have just started research. The car originally came with drum brakes and has been upgraded to Wilwood discs. I believe these to be the "small" lower ones? Also research on here leads me to think everything was the same until 1973?

Do I just approach my local auto parts store and say ball joints for a 1967 Dart? I did a quick look of Mancini's page and it looks like roughly $100.00 or so per side? Is there another place I should be looking? Thanks so much for any help!