I may diy because I'm not sure if the mechanic will be changing the right part. There seems to be multiple names for one part so there may be confusion on which part he is actually replacing. The quote says front lower control arms. I will be purchasing the whole tension strut.
Found this which should give the correct terminology RealOEM.com - Online BMW Parts Catalog
#5 is what I will be purchasing

Thx for the input.