That's a bit pants mate, do you have the blue and white plugs in the back of the radio? if so you maybe able to upgrade to a 4:3 or wide screen.

Like so?

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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.