He encontrado esto:
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N90905903 (12 quantity) fastens exhaust bracket to bumper - per schematic dealer provided it called out for 12 however, thinking you only need about half ?WHT006099 (4 quantity) nuts for belowN90974701 (4 quantity) these hold the exhaust to brackets 8W0807347A (bracket)8W0807348A (bracket)8W0253826E (pipe tip) 8W0253825E (pipe tip) 8W0807521SRU6 (Valance/diffuser)No need to take off entire rear bumper just need remove current valance then shim the brackets that hold the exhaust along with some screws. I am just needing 8W0853551RN4 to complete my option perhaps another 3 months more as I cant find a decent price in the US??
Correction - N90905903 X8, 4 on each side
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en: https://www.audiworld.com/forums/a4-b9-platform-discussion-212/retrofitting-revised-rear-valence-assembly-non-2019-model-2964384/page2/
pero dicen que para el TDI con adblue no entra. Hay una persona que incluso dice que lo ha comprado y lo tiene por casa