Avant Garde Wheels M359 - http://www.avantgardewheels.com/m359.php
20x9 on all corners
245/40-20 tires
These tires are closest in size to what comes on the front Tesla 21" wheels and are used a lot on people's 20's. However, they look a little narrow on these rims. Someone posted that they have rubbing with 255/40-20's on 9" rims, so probably nothing to do.
You will need hub centric rings. I bought 64.1mm - 72.6mm. They are a tiny bit loose on the hub but fit the wheels fine.
The stock lug nuts are too large to fit these wheels.
The first set of lug nuts I bought were 1.9" tall which looked funny:
So, found another set that are 1.4" tall. These are not as common but worth it. They take a 19mm socket.