The general rule of thumb for the CCM units is to ensure all of the buttons at the bottom match those originally in the car, and the model years match up (not necessarily the registration year, also not an easy game if it wasn't you that replaced it!)
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Current - 2004 Volvo V70R Titanium Grey - 67k
2008 S60 2.0t Sport Electric Silver - 156k
2000 V70 Classic 2.4M Signal Red - 240k
2001 Audi A6 C5 Sport Avant 1.9 TDi - 173k
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