https://www.specialized.com/ua/en/stem-face-plate-for-accessory-mount-kit/p/177129?color=287416-177129
Update your cockpit with this replacement stem face plate that is compatible with the integrated accessory mount kit.
face plateaccessory mountstemkit
https://www.specialized.com/us/en/proprietary-specialized-stems-accessory-mount/p/4242453?color=5376242-4242453
Sturdy accessory mount that mounts to the face plate of various proprietary Specialized stems. Position your accessory device right in front of the stem...
accessory mountproprietaryspecializedstems
https://www.geeky-gadgets.com/camera-universal-l-cage-port-protector-and-accessory-mount-06-09-2018/
Returning to Kickstarter for the fourth time photographer and camera equipment designers ProMediaGear has revealed their latest creation in the form of
camera universalaccessory mountcageportprotector