I think he's talking about cars that have been already built (like my 2008 that didn't have the black headliner as an option at the time). And no, I'm not aware of any way to upgrade other than ordering the necessary part numbers from BMW and having a shop rip out the old one and put in the new one.
-2012 VW MKVI GTI Autobahn w/ DSG (New!)
-2008 E82 N54 135i Coupé 6MT
-2001 E46 M3 Coupé 6MT (Retired)