Some places (mercedes dealers) will try to hold your car hostage if you dont replace the whole set if one is bad for any reason. Or if they don't like your date codes. They keep saying it's liability, its liability
That's why I go to Mexican tire places where they will put whatever f*&in tire I tell them, wherever on the car I want it.
I don't need a snooty service writer to tell me what I need and what to do with my car, I'll tell them.