For sale is a monitor arm VESA mounting plate for the Humanscale series of monitor arms, including the M1, M2.1, M8.1, M8.1 w/ Crossbar, M10, and M/Flex products.
Comes with 4 screws and 4 plastic spacers.
I have a large number of these, as well as M8.1 monitor arms and M/Connect and M/Power docking stations. Contact me for more information or bulk orders.
Buy more to save!