The holder is from this design: https://www.thingiverse.com/thing:3017901 by marcospoorman
ATTENCION: just the roll.stl file is to the dimentions of the marcospoorman holder, the rest is 1cm longer, because new BQ rolls are a little larger.
And there is in the file two diameters sizes, 44.5mm and 52mm.
The size of the bearings are 8mm (core), 22mm (outer diameter), and 7mm (width). The typical size of bearings for Skateboard.
I have a box for the tools and the rollers for this design at https://cults3d.com/en/3d-model/tool/box-for-tools-and-rollers
This are some designs that I and my brother made for our projects.
I hope it will be useful to you.