The F85 X5M and F86 X6M use this friction disc to increase the friction coefficient between the rear wheel and the wheel hub.
Fits left or right. Sold individually.
This part is listed by BMW as BMW part number 31108053074 (31-10-8-053-074) and is described as Genuine BMW Friction Disc for Rear Wheel Hub on F85 X5M (2015-2018) & F85 X6M (2015-2019).
BMW Fitments:
X5 Series
F85 X5 M (2015-2018) > X5 M (15-18)
X6 Series
F86 X6 M (2015-2019) > X6 M (15-19)