Hooks for HOMEKOKO Coat Rack Shoe Bench

I wanted additionnal hooks on this bought on AMZ : 
HOMEKOKO Coat Rack Shoe Bench, Hall Tree Entryway Storage Bench, Wood Look Accent Furniture with Metal Frame, 3-in-1 Design

There is 2 models :

• One fit, have to force throught it with small hammer.
• One fit but less 0.2mm so that it can be inserted better.

Feel free to print only some layers of the print to see if it fit.

The top bar is 20mm by 20mm (square)