The original aluminum accent piece (Part Number 51 41 8 258 997) on the left interior door handle was scratched on my car. I ordered the replacement part from Peter Pan BMW, and successfully installed it in <30 minutes.

To remove the original accent piece, carefully insert dental floss (Glide) between the bottom of the accent piece and the leather door handle. The latching mechanism of the accent piece is on the bottom. Once the dental floss has been positioned behind the accent piece, gently lift up on the dental floss and the part will be released. Install the new piece from the top, and then snap it into position using the bottom latch.