The problem I found was that the OEM torx screws for the "mustache" parts are too long for the aftermarket mustache parts (or the other way around). You'll be tempted to tighten the screws beyond the available thread length of the grill piece. So, buy a washer to shorten the length of the screws, and/or make sure you don't over tighten the torx screws when fastening the aftermarket parts.
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