Black Sapphire Metallic ("BSM") Mirror Cap Set from IND.
These are OEM mirror caps that have been painted BSM in their BMW-certified spray booth. Currently packed in microfiber cloths and bubble wrap in basement, will post some photos when I have a moment. They were used for 20K miles but are in excellent shape with all clips intact, 7-8/10.
MSRP $274.95 before tax and shipping.