As I understand things the sensor pad can be moved from one windscreen to another (very carefully), failing that you will need a new sensor pad adhered to your replacement screen.
I am on windscreen number 4 or is it 5 ??? Anyhow I have the 'elcheapo' version in the car now and it seems to stand up to the minor everyday hits better than the OEM screens I had. After four moves from windscreen to windscreen the sensor gave up the ghost and needed to be replaced.
Once the new one was fitted it all worked fine!

