Comes as pictured.
The diameter of the “bearing bank” of this hub is 25mm, and the width 18 mm.
Those newer Mad4one hubs are 25 mm also.
They use 6905RS bearings (25x42X10) + 42x2 spacers.
That would fit on this equally.
To use it on the new sizing on Impact unicycle (usually two times a 22x32x7), you could use for example three times the 617052RS (25x32x4) and 3D print a spacer of 2mm.