We have 2 sets in stock, they do fit and are not made in China.
They are Taiwan only.
They will fit with any bumper for non-M5 car - M5tech, Mtech, standard bumper.
They will not fit factory M5 cars...however, that's anecdotal, we now have a shop E60 m5 and if we have time, we'll test fit these on it in the foreseeable future so that we can offer them as a viable replacement possibly for real m5s.

 

Can you verify whether the width of the wheel arches are as wide as the oem m5 fenders?

 

The post above would imply that they are not wider as they do not fit M5s. I would suppose that it is because of the wider wheel well liners.