I bookmarked this place some time ago. They really restore old wood trim. They can reveneer, revarnish, etc. pretty sure I can't afford them though.

Madera Concepts - BMW

Oh yeah I was looking at this company today and the work they do. Very detailed and driven to produce perfection in the restoration of the wood.

Realoem has something called "Smoke Grey Poplar Wood". Could be the same trim you are looking for, but maybe they use a slight different name for it.

Linky to realoem for p/n

This the only order code I could find for that
SXE2A Indi. fine wood quilted maple anthracite

If you can get the vin from the car it came from, you could look up what it was called