I think you can get a convertor, not sure about the 2 smaller (10/12 pin) plugs that plug into the bottom of the big radio module plug though, you may also need to convert them too.

You could probably make a 17 round pin to 40 quadlock convertor out of two SOT leads, It would cost about £15/£20, (fairly straight forward, if you're handy with a soldering iron).

Or replace the tuner for a newer BM54.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.