Check the review from Ron Brown about the HSU windslayer.
"Using nothing more than a very affordable foam cage you can block out most of the wind noise on your Hero 7. And it doesn't fit tight like a glove, so I'm sure it will work many other Heros such as the 5,6,7, and 8 series. I don't know about the Hero 9, I hear it's little bigger in size."
