Ergotron HX Heavy-Duty Tilt Pivot Addon for the HX Monitor arm

HX Desk Dual Monitor Arm (matte Black) Two-Monitor Mount

Ergotron Part# 45-476-224

Monitor Mounts and Stands – Desk Mount - 32" Maximum Screen Size Supported - 75 x 75 Mounting Pattern - 100 x 100 Mounting Pattern - 200 x 100 Mounting Pattern - 200 x 200 Mounting Pattern - 400 x 200 Mounting Pattern - 400 x ...

HX Desk Monitor Arm (matte Black) - Heavy Monitor Mount

Ergotron Part# 45-475-224

Monitor Mounts and Stands – Desk Mount - 49" Maximum Screen Size Supported - 75 x 75 Mounting Pattern - 100 x 100 Mounting Pattern - 200 x 100 Mounting Pattern - 200 x 200 Mounting Pattern - Matte Black - China - 42 lb Maximum ...