Have you seen this page? It seems that some models are incompatible.Bought a CC3 for my Smart ForTwo 453 from Teyes website and it doesn't fit at all... really disappointed.
The upper left/right parts of the back of the head unit where the antenna connector plug in stick out too much to let me slide the head unit in fully to close things up.
How responsive is Teyes support? I imagine I'm gunna have to refund it... Which is super disappointing because it's miles better than the AC8257 unit I was upgrading from.