I just received an email from Tesla's referral program stating that I've earned the 21" Arachnid silver wheels and tires. I have special wheels already so looking to transfer/sell them to another Tesla Model S owner. I checked with my local Tesla service center and they come with Continental Performance tires and installation too. There MAY be a cost to transfer to another service center but they didn't know for sure. I haven't gone through accepting them to a local service center and should be able to send them to any of them. I'm located in Los Angeles and looking if anyone might be interested. Please private message me if so.