You can't connect the 54pin Bit II connector to the ULF as this won't work (as the plug has different pins connected inside the plug) and you *may* damage the ULF.

There is a converter plug for the Bit II (I think), but I don't have the part number.

You will need do disconnect all the Bit II modules and change them for the BT equivalents, you will need

Either the correct BT retrofit loom or the converter plug
The BT antenna,
The BT cradle and insert (inc the pair button).
and possibly the fakra antenna lead.

You can use the mic, but that’s about it.

HTH

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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.