Amazon.com : GEPULY Frame Mount Protective Housing Case with Bracket Accessories and Lens Cap for GoPro Hero 3, Hero3+, Hero 4 Black Silver Cameras : Electronics
MODIFIED GOPRO HERO4 SILVER CAMERA 3.5MM RECTILINEAR LENS RIBCAGE AIR BACKBONE | eBay
See What's Inside the GoPro Hero4 | Time
Recsea WHG-HERO4S Underwater Deep Housing for GoPro HERO4 & HERO5 Session