Esto es lo que me ha contestado el de navitech Hi,
Thank you for your inquiry on our system.
First of all, can you please send us the photo of the back side radio of Zafira?
There is totally 3 type of video interface for all OPEL models, and if it's 7" LCD than it's GM IOB Radio not GM IO4,5,6 unit.
If you send me some clear photos than I can identify you the system exactly.