You say " I've seen a bunch of 123's and 126's with this problem. "

What problem?
The misaligned wheel?
The rusted control arm? It doesn't appear to be deformed or bent in any way obvious to the eye.

I've fixed a lot of cars in my day, in fact was ASE Master certified until recently (but alas no foreign cars). I have never seen a case where one just rips out a control arm and replaces it to cure a misaligned wheel, unless the car has been in a collision.

Cordially,

Tom