You can find them easily enough - just feel in the gap between backrest and squab and you should have a pair of 4mm diameter pins between brackets, 1 on each side of the outer seats.
From experience of using them on my '02 S8 they can make modern child seats sit at rather an odd angle, particularly for rearward facing infant carriers. My son tends to loll forward in the seat when he's asleep in the S8, whereas in the A6 he stays head back. Access to the Isofix anchorages is also extremely tight and Maxicosi spreaders won't fit due to the side airbags.
Don't think I've got a pic of mine installed - will have a look
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