Advantages of aftermarket upper:lower control arms

Here is an example of the cut required for PST upper control arms.
View attachment 1715739020 View attachment 1715739021

That’s actually not a good way to execute that cut.

A smooth cut with a radius like I showed is the way to do it. The UCA is tubular anyway, the square corner does not improve the clearance any but it does provide a place for a crack to start.