There are a few posts on the Polestar forum on spacers. I have them on my 2017 S60 P*. Since I didn't want to make any modifications, I went with 10mm in the front and back. I purchased them from Viva. It gives the car a bit more of an athletic stance. There are a few guys on here running larger spacers on their P*, but they had to do some modifications to the rear wheel well liner and wheel lip opening in order to fit them without rubbing.