They are not standard. I have seen some fitted as factory options. It's listed on the window sticker at something stupid like $250. Some dealers put them on, and add on a nominal fee to the sales price as well. And some customers buy them after the fact. To be honest, I hate them. They're not worth the hassle. If some jackoff with an impact gun overtightens them, be prepared to pay someone with a special removal tool, or catch hell trying to remove them without the special tool.
ASE and BMW Master Certified Technician
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