I have found that the C pillar roundels do not have nuts holding them on and RealOEM shows no nuts either. Yes they are threaded but just push in.
Love the license plate! And yes I’ve noticed that it photographs best against a dark background. This is a shot of my (soon to be delivered) coupe from BAT taken two owners ago, and even though it’s old (the extra front marker lights are now removed) I think it’s my favorite in terms of showing off the lines and stance:The Chamonix is a wonderful looking color especially under a cloudy sky!
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