Nexus 127mm RB-Nex-82

I have a couple of questions about these omni wheels.

What are the bearing dimensions that’s used for the main axle?

Is there a package that can be ordered to use these as a caster, and directly to an axle? I’m trying to use these omni wheels in this type of application:
youtube.com/watch?v=yN-_-7zWKDY

Thank you.

Ok, I found my answer to the first question (bearing dimensions);
robotchassisparts.com/wp-content/uploads/2016/09/127mm-Heavy-Duty-Aluminum-Omni-Wheel-Layout.pdf

But I would still like to know if there’s a package that could turn this into a caster, like shown in the youtube video in the original post.

Unfortunately there’s no custom U-shaped bracket available for that part.