The 3 STLs available are a general purpose hook that is 3 inches long, the same hook for heavier items (I just use these for everything, you could say they're just an upgrade), and a hook made for common stackable plastic boxes. The box hooks fit 2 different brands of box I had lying around without changing the dimensions so I am hopeful that they will fit many common boxes you may have.

In case anyone who has Autodesk Inventor available wants to edit the parts I have included a zip of my local folder with my ipt files.

Thanks for looking and I hope someone gets some use out of these things!