Replacement part for damaged wing mirror - info request

[NetBIOS]

Hi all,

New member, recent car purchase....

Issue:

Whilst reversing, I managed to clip a gatepost and have damaged my right wing mirror in my A4 avant B9 (2022).

Only an internal front shell piece is damaged and the mirror functions perfectly.

From the attached images, it looks like it is part 3 that is required.

(Yes I know this lists it as a right side mirrror and shows a left one!)

Question:

Where could I find a replcement for that compoent; I assume that it is indeed  sold on its own?

Many thanks 

Nigel