Try Graham at
[email protected].
He’s a BMW guy like us, and if he can’t get it perhaps he can point you to where you can. He’s a regular poster over on bimmerforums as he’s done some very difficult builds. I just got several meters of anthracite uberkaro cloth from him for my X5 seat centers, and previously have bought black M3 headliner from him when I redid my headliner and pillars. Everything had been as promised.