No problem, thats what we're here for
And yes thats the correct hub for the Kit of Parts Toughbox. I don't know if it makes a difference or not, but my team is using the 8" mecanum wheels this year, and we choose to use 2 hubs per wheel (on on each side) for added strength to the side walls of the wheels.
If you have any other questions feel free to message me on here.