That rod in the second link has 1/4” and 3/8” holes for mounting your camera and accessories to a tripod. It has M12 (female) threads on each end. M12 means "metric 12mm" For example, the lens in your dash camera is called an M12 x .05 lens because its barrel is 12mm in diameter and it has a .05mm thread pitch.
I made my 'MadMax' Mobius mount from a metal tee bracket, a 1/4-20 bolt, and a nut. I simply bent the bracket for vertical aiming Easy to fabricate mounts for the Mobius and other cams using that tripod thread.