1.5" 8020 limit switch and rail slot clips
These are designed to snap into the center channel in 1.5" square 8020 aluminum extrusion. The clips hold tight even after several cycles of removal and replacement. They hold so tightly that it takes several lbf to slide them in the slot (far more force than will ever be applied to a limit switch!). you may need a screw driver to pry them out!
Watch for more 8020 oriented parts to be added in the immediate future...