I bought mine at
Car Covers Direct: Quality Custom Car Covers to Fit Any Vehicle. I go it in the Block-it NOAH fabric as I attend the Imports at Carlisle in May and have to keep it outside while there. Otherwise I probably would have just gotten an inside cover. I really like my cover and it still fits with the aero parts, don't know how well it will fit when the wing goes on. But nobody makes a vert with a wing that I know of.