My dealer is confirming whether the spare retrofit is possible in the US diesels. It is a factory retrofit for European cars, but not sure if they have the urea tank in them or not. Trying to determine if that tank uses up some of the space needed for the spare or not.

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09 E70 35d (Space Gray/Tobacco)
08 Audi RS4 Cabrio (Sprint Blue/Silver)
2010 Audi R8 V10 (Velvet Purple/Black-White)