I don't know if this has been mentioned before, but for them who want it, just go to realoem.com and you will find the Roofliner Alcantara anthracite and the other parts to complete it [under European models]. It will not be cheap, but if you love your car just like I will, it will be worth it
Here is an example.
http://www.realoem.com/bmw/showparts...57&hg=51&fg=40
I used remmib's picture in my 5 series gran sedan blog here on bimmerpost.