It is used to correct bumpsteer...
You have the lower control arms moving up/down in a arc (where the wheel is).
YOu have the steering arm moving up/down in an arc (A DIFFERENT ARC) in relation to the a-arms.
To get these two to match movement, _sometimes_ you need steerin rack bushings, sometimes you dont. Sometimes you can machine the back of the rack and move it rearward...
"Typically", if you lower the car, you might benefit from offset bushings that raise the rack.
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