https://www.getbmwparts.com/p-f80-lc...r-51628076872c
Are you sure? there are websites across the US and europe that list it.
I believe the parts departments ask for a VIN to ensure the part will fit via ETK to not cause headaches for refunds or returns.
(I use to work in BMW Parts dept here in AU). There was a time where m performance exhausts were blocked from ordering due to not being compliant in our country.