I don't think I've ever seen anything aftermarket that would bolt on easily. The one in the article looks decent without the flares, but I think you'd get a lot of mud, dirt, water thrown up on it without the flares.
By the way, thanks for the link to the article. The author is clearly unqualified to judge cars, only knows enough to try to be funny on his blog. I posted a response and a picture of my Kammback so people can see how cool these cars are.