I'd question why they felt it was necessary to replace half the front end if the vehicle was "within (their) given tolerances".
I'd also ask for a copy of their acceptable tolerance amplitude for oscillation within the steering system, or whatever applicable tolerance metric they are using to make this determination.
I'd try to find a model to test drive with the same options and tires as yours, and see if the steering still vibrates. If it doesn't, I'd aim for a swap. This would clearly demonstrate that it's vehicle-specific, not option-driven.
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