Does anyone know if the 20 inch Silver Helix wheels that Tesla offers as an option, are available from an aftermarket source somewhere? I've found Cyclone wheel like the Model S option that will work also with the Model X, but not the Helix. On a side note, does anyone know what T-Sportline charges for their flat rate shipping to the US for their wheels? You can't find out without giving credit card information in the checkout process. Does anyone have any comments about their quality?