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Old 02-11-2020, 08:23 PM   #4
17rsvert
 
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Drives: 2017 HBM 2LT RS Convertible V6 A8
Join Date: Jan 2018
Location: NJ
Posts: 654
I had those replaced under warranty on both sides. There is no part number available for just that rectangular cover; it is part of the assembly (which includes the entire cover next to the rear seats) in which it slides. The cover gets pushed open on curved tracks by the top mechanism when the top goes up. When the top opens, a coil spring (like in a tape measure) slides the cover up and back and closes the opening.
From what I understand, there was a redesign to the entire cover which added an extra clip to make it less likely to flex and break. As part of the redesign, the rear window regulators were also redesigned to accept the new clips, so the regulators must also be replaced.
You didn't mention your year or warranty status. If you are under warranty, just get it fixed at a dealer.
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