Okaaay, gotcha! Sorry for the confusion- it just wasn't making any sense in my head!
I have never come across that on a ball joint before, Proforged, Moog, or whatever.
What I would do is use appropriately sized machine washers (not just normal bolt washers- use
machine washers) in the recess between the ball joint and the spindle.
View attachment 1716338803
Should be available at good hardware stores, Fastenal, McMaster-Carr, etc.