1970 lower ball joints

Has anyone rebuilt a lower control arm for a 1970 and replaced the ball joint? I have searched for lower ball joints and all I find are complete control arms. I am trying to use as few reproductions as possible but some sacrifices must be made. I have good cores and the correct ones for a 70, just having a hard time finding the correct lower ball joints to replace them. Where can I find the correct replacements, or what brand or where to search?

As always, any/all help is greatly appreciated! Thanks!

Open tracker has ball joints only on his website.