This part numbers might help you.

FOR X3 VEHICLES WITH TOWING HITCH, DETACHABLE DIFFUSOR M-sport part no. 51123433424

TRAILER HITCH FLAP M-sport part no.51123414413

Cheers!

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X5 35D X-Drive TwinTurbo Power
Jet Black/Sand Beige Nappa Leather/Poplar Light Wood Trim/Premium package/Technology Package/
3rd row seating/SLS/Running Boards/Convenience Options/4-zone automatic climate control/
Keyless entry/18"light alloy Star spoke wheel Style 210 with all-season run flat tires.