@Stoti
The 9 is larger, so I am pretty positive that they don’t fit in the current 5,6,7 GoPro Sideshot mount. I don’t know about other systems, or if anyone has developed an attachment yet like Orion and others did for their Fireflies.
In talking with Haji, he suggested the 7 Black was the way to go, so I’m just waiting for all the parts to arrive.