That is the correct menu item to edit, you need to change rom_col_2 (wide) and rom_col_3 (split), the others are for things like the mini etc...

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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.