Ergotron LX Dual Monitor Stacking Arm - No Grommet Mount - Supports 2 Monitors - VESA Support: 100x100mm, 75x75mm - Grommet Mount Not Included - Weight Capacity: Up to 9.1KG Each Monitor - 45-492-216...
Ergotron Grommet Mount Kit for LX Dual Arm - Rocket-Solid Base - Sturdy Steel Construction - Includes Grommet Plate, Bolt, Wing Nut, T Wrench & Cable Ties - 98-035 - 10 Years Limited Warranty