That is custom fabrication for the blinkers. It'* very well done, though. Do a search for 95naSTA and his Bondoville
. He put in BMW 7-series headlights. Here'* a link for the initial post:
It seems you'll have to cut the mirror housing and use bondo to mold in those blinkers. I've taken off my mirror housing, and it'* fairly easy with two bolts and a cable. There seems to be enough room, but the bigger the housing, the better.
Good luck! If you do this, please take pictures. It seems to be a cool project.