Did you try the ebay ? Not sure they will sell/ship to Russia, and then will come the challenges around the installation and voiding the warranty... I am pretty sure BMW Russia will try to find any reason why not to service your car under the warranty (or so I heard from my friends there).

Now, to be more helpful, I've tried to search internet for the part number, and did not find anything. It is quite possible certain parts are available through the BMW's internal network only.

I suggest you find your "way" ($$$) to the parts department's manager

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His : 2013 X5 3.5d Deep Sea Blue/Black/Aluminum with ALL packages, 20" 214"s, running boards, Adaptive Drive, Spare Tire, BMW Apps
On Order : 2016 X3 3.5 MSport Silver/Mocha with DHP, CW, Prem, Tech, DA, Lighting

Hers : 2015 328xi MSport Silver/Red

Prior:
2008 X5 4.8
2011 X5 3.5d
2010 335 xDrive
2013 335 xDrive