There is no need for any dealer to fit any parking sensors that do not look exactly the same as factory fit ones, in UK SEAT dealerships should all be offering the latest version of Vodaphone kits which used to be branded Cobra, and there is a version of kits that has sensors that look exactly the same as factory fit - though none of them will integrate into the car's system in the same way as the factory fitted ones will, that would just cost too much in labour charges.
If they're factory fitted then they're flush. If it's an aftermarket system, not necessarily fitted by a Seat dealership, then it might not be flush.
It might have been a dealer fit accessory system. My car has factory sensors and they're all flush. If there was a car to her spec available but without the sensors then the dealership might have just fitted them.
I searched on the internet as the original type of parking sensor, and I came across these sensors. I bought it from my own country, if you can't find it, you can buy it from China. I painted it first and then assembled it myself. I advise
Hey would you be able to share the name or model of the parking sensor please? I am planning to replace my front one