I am not sure what you are discussing here. In the passenger foot well?
If that is on the floor, could it be the foam under the mattress
Anyway, some measurements looks to be in the neighbourhood of mine. If so, this is how it looks on my car. Left wheel drive, of course. Apology if you mean something else
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Johannes
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Audi S8 -99, Pearlescent, Alcantara/silk napa leather, Burr walnut insert, Alcantara roof lining upper pack
A8 32V engine
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Jeep Grand Cherokee -98