Here is a link to Receiver Audio Module (RAM) for a 2019 Z4 in realoem.com. I'm guessing the current ones look about the same. If you look at the list below the diagram, you can see how many different versions of the RAM there are.
https://www.realoem.com/bmw/enUS/sho...91#65127928513
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2002 M Roadster, Steel Gray Metailic, Gray Nappa Leather, HT, TC Kline DA Shocks & Camber Plates, w/H&R Springs, Stromung Exhaust, SSR Type C. Looking for new home.
2022 Z4 M40i, Misano Blue Metallic, Driver Asst Pkg, Prem Pkg
2023 X5 M50i, Phytonic Blue, Black Extended Merion Leather, Driving Asst Pro Pkg, Park Asst Pkg, Exec Pkg, Climate Comfort Pkg.