Euro-pegboard holder for small, stackable boxes

I've had some cheap, small (9.5 x 10 x 5 cm / width × depth × height) stackable boxes lying around that I bought in a set made by "deuba." They came with their own plastic mounting system, which I ditched because I wanted to go a more versatile route with a Euro pegboard wall.

So, I designed a Euro pegboard holder on which the boxes can safely and snugly fit.

Although they should be standardized, I found my pegboards to have slightly different fits, which is why I designed two versions with different holder thicknesses (4.9 mm and 5.1 mm).