I know this is an old post but it was the only one I found that seems relevant. I found a sunshade that, while not fisker branded, does fit perfectly and was designed for the karma. It isn't as heavy duty as the ones I have for my other cars but, like I said, it is shaped specifically for the car's window. It is a "Heatshield" pattern 1358 - got it from heatshieldstore.com. Was about $45. It will due for my needs and is better than baking the pseudo suade dash here in Florida. Hope this helps someone...
Randy