Ball joint socket size and where to purchase?

Update: the upper ball joints are out! The proto socket fit snugly and they came out without a fight… well soaking in a bath of pb for over a week anyway… but I wonder about the threads you guys have been mentioning… here’s a few pictures… am I in trouble with the threads as is for new ball joint to be able to catch? Or should I think about replacing control arms or consider the Tac weld idea? Thank you everyone for your participation and feedback! Calling it a night for now. I think she’s knows I’m here to help…