A3 Quattro V6-3.2L (CBRA) (2009)
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Slide noise insulation - 3 - into bottom of lock carrier - 2 - as shown.
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Narrow tabs arrow - a - must be inserted beneath, and wider tabs arrow - b - on top edge of lock carrier - 2 -.
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When doing this, retainers on wider tabs must engage in holes of lock carrier.