I pretty sure that the 4:3 monitor is identical to the BMW unit, (without the BMW logos on the front) upgrading the rover 4:3 to the BMW 16:9 is quite common upgrade.

All the parts are the same (95% sure), but get the BMW nav drive (mk3 or mk4), however as jochen says post some pics up (just to be sure).

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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.