Do you have salvage yards there in the UK? Might be able to just get the piece you need.

FWIW, I had the passenger side rear view mirror glass taken from my RACE car while it was parked overnight once. That's a lovely thing to have happen...

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Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual