Amazon.com: for BMW (2005-2012 E90 E91)(2010-2014 E84), Car Door Panel Loud- Speaker Cover Grille Trim 3' X1 318 320 325i, Aftermarket Replacement for 51417144559 : Automotive
VIBE COAXIAL UPGRADE SPEAKER for BMW 3-Series E90 Sedan 2005 – 2011 Front door | eBay
BMW E90 Sound System Upgrade: Speakers & Amplifier | BimmerTech