Hi Sweden,
Have you Got The OEM radio or aftermarket?
But simple answer should be...
Yes you need a new 8c PDC module, the new sensors and the loom. For front and rear.
Or a 4c PDC plus sensors and loom for just rear.
There is Also an illuminated disable button on the dash and speaker/beeper you will need.
And some VCDS coding to make it all work.
A fairly simple job once you have all the kit.