Buy 'em and put 'em on. They will eliminate that wind problem for good! I've had them on every touring bike I've ridden until this last one where Harley quit making them to fit the Rushmore Ultra models. Your Road King will love them.
You don't have to get the chrome ones!! If you have a black bike, you can get black fangs. I suppose if you are all chromed out, they would need to be chrome. Here is a pic of the black ones on my last bike, road king special. If you have a blacked out bike, they blend in nicely, I don't even notice them.