Crazy alignment problems

A long time ago, a buddy with a '73 Swinger said his front end was weird.
The strut rod bushings had been replaced with the wrong ones, and you'd see the front wheels move an inch or more when pulling forward and then backing up. And the stock K member is centered with the 4 tapered bolts that bolt it to the unibody.
How do the aftermarket Ks accomplish this?