Thank You to the OP for posting this thread.
I am a new member here and a new BMW owner. I just purchased my car on Friday, March 22. I was originally going to pay the Stealership $60 to switch out the grills (labor only). The hardest part of this mod was squeezing your hand/arm behind the bumper to pop out the tabs. Mind you, I am no Joe mechanic. All in all it was a fast and easy mod.