The STL / STEP files included are specific to the harbor freight socket sets 69344 (SAE) and 69346 (metric), they may fit yours but I recommend downloading the parametric file and customizing the parameters to fit your sockets perfectly.
2 of these holders fit in the Hart Stack Organizer for which I have shared a fitting base-plate. These are just 5u tall so nothing but the base-plate is needed for them to be secured inside the toolbox.
The author marked this model as their own original creation.