The original extended wall spacers perfectly fit my Crosswind/desk setup. However, when printed with Inland PLA+, with 75% infill - there was still too much flex in them. I added horizontal bracing to reduce the flex, and a square interface with the wall to increase the surface area and minimize rotation. The slots are spaced far enough apart to allow for slight shifts in each slot, and the bracing is small enough to allow for a bolt on either side.
Printed with Overture PLA Professional at 50% infill with three walls. Will test and determine if that needs to be increased.
The author remixed this model.
I added bracing to make the standoff less flexible, and made a flat surface to interface with the baseboard.