Yep, you are missing a captive nut- happened to me too.
The tricky thing is that it isnt a rivnut, but knurled, so the hole is bigger than a normal M8 rivnut. For mine, i ended up fitting an M10 ally rivnut and drilled out the other parts to fit the larger bolt.
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2004 A8 3.0 TDI Sport Brilliant Black - now gone
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