I have had set made up, they use the bolt in lower jag ball joint.
I have made new mountings drilled and tapped rather than the shafts. The mount in welded to the chassis as this arangement allows for a simpler adjustment of caster and chamber.
That is what I was thinking of doing, set up for the track then undo the bolts wind out 2 turns then it is right for the street.
Phil