I bought these ones and they worked great, it's a straight swap, you don't have to do anything with VCDS or anything like that. They are really easy to change as well. https://www.amazon.es/gp/product/B07DYQ528T/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1
When you are in AUX mode, you will find an option to set up the AUX Volume. I don't know exactly which button it is, but should be in the SETUP or SETTINGS of your radio.
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