This product is either discontinued or we cannot get that from suppliers.
ATDEC SH467175B Six Display Articulated Desk mount kit, Capacity up to 26.4lbs, VESA 75/100mm, Easily tilt, pan, and landscape to portrait rotation, Green Star, Advanced cable management, Security screw, steel and aluminum, BLACK
The SYSTEMA SH137175B is a six-arm combination attached to a 29.5" post.