Dowco cover size XL fits Concours and other touring/sport touring bikes. I bought this cover from Murphskits a couple of years ago for my C-10. But I sold the bike before I used it.
It's new in the box, never on a bike. I didn't even try since I know it's too big for my Ninja.
Link to cover - http://www.classiccruiser.com/DOWCO/Khaki-Guardian-WeatherAll-Motorcycle-Cover/809342/
$50 shipped anywhere in the lower 48.