This remix of the Under Desk Drawers brackets by Godard Scientific, allowed me to mount an additional reasonable-sized drawer unit on the left and right edges of a TekDesk standing desk. The width on the outside of the desk's mounting T-frame on the left and right sides is a mere 140mm and adding a left and right mounting bracket will leave very little space for a drawer unit.
The remixed middle bracket fits over the desk's T-frame mounting bar and forms a continuous mount with the next drawer unit. This adds some valuable drawer width for the edge drawers.
The author remixed this model.
I modified the brackets to be compatible with a TekDesk standing desk and its mounting T-frame that will allow an additional drawer unit to be mounted on the left and right edges of the desk.