I assume you mean the dash/doorcard trim?
Plenty guys breaking E46, Should be able to get a complete set for around €100ish. (Depending what it is)

Dash trim is very easy to change, You will need to remove door/quarter cards to change the trim on the handles... Tricky but not impossible.

I'm only guessing but I assume what you currently have is 'Brushed Aluminium' and white carbon you describe is probably 'Carbon Cube' (Also available in black)