I seem to remember the last time a question like this came up someone pointed out there's a difference between a true double DIN size surround and the larger OE size that is close to double DIN.
There isn't a true double DIN one available from Seat. For the larger OE one get a dealer to find the part number for the correct one for your car. This will give them the colour code which can then used to find the part number of the correct colour larger one.