If you're considering this change: Swapping To Urban Line Kidney Grilles
You can order the  parts from your BMW dealership and stock arrives in 2 working days.
LEFT URBAN LINE KIDNEY GRILLE / white gloss and chrome at £33.49
Part No. 51 13 7 262119
RIGHT URBAN LINE KIDNEY GRILLE / white gloss and chrome at £33.49
Part No. 51 13 7 262120
HOW TO CHANGE THE KIDNEY GRILLE
Step-By-Step DIY instructions to swap the grilles over here http://www.f30post.com/forums/showth...=kidney+grille
[Requires some tools and DIY capability, its not entirely straight-fwd, but does NOT require removing the bumper whatever the dealer tells you]
Ask your dealer to do the swap for you FOC (go via your sales manager)
They quoted me £150 for the 10-minute job and I burst out laughing, then they said they'd do it FOC
Hope this is helpful.