Craig, I learned of the configuration years ago from my local short track racing shop. They carry all the parts "a la carte" and I bought whatever was close and cut to fit.
The welded stud stabilizes the ball joint housing.
The angle/housing would work better for me with my fabricated uprights. My perpendicular ball joint housings work best with flat angle UCA, not quite my case, but the camber gain is good.

Ordering through a local shop is an exercise in patience but Summit has not been timely either. SS Vibrant exhaust bends are back-ordered, yeah, China and the West Coast port.
jim