Not to mention that all the COTs or nearly COTs assemblies on their cars are made to the same spec as they are for whatever other OEM buys them.

A TRW unit bearing supplied to Tesla in one bolt pattern and spline configuration isn't any more precise than the same bearing assembly in a different bolt pattern and spline configuration sold to GM.

Tesla is not in a position to dictate abnormally high tolerances to it's suppliers for stuff like that.

Edit: Why am I being down-voted. Is this not a correct analysis of the situation?