I just received the Vossen Wheels CV2 and Pirelli winter setup I ordered back in late September. Looks great, rides well, I'm happy. Here are the details:
Wheels: Vossen CV2 in 20x9 (+35 offset all 4 corners) -- required hub-centric rings, provided by Vossen at no charge -- color: Graphite
Tires: Pirelli SottoZero Serie II 245/40R20 (front) and 255/40R20 (rear) -- offset sizing to better match P+ default widths
Pics (click to enlarge):
Overall (note: car is at "high" ride height in this photo):
Close-up (note: car is at "high" ride height in this photo):
And yes, four 21" stock wheels DO fit in the car:
Cost a little more than the Tesla winter wheels kit, but Tesla was constantly out of that anyway, so it wasn't really an option. Plus, I like how these Vossens look better, but that's just my opinion.