I don't think anybody in the US carries the Square stuff unfortunately. But, the c-hubs they make are really tough, and hold up quite well. The composite pieces aren't even usable in my experience. I do use the rubber ones sometimes, but I'm beginning to think they're just too inconsistent when the traction comes up.
Does TamiyaUSA or Ampdraw have the spool cups? If not, you might need to throw them in with your HK order for c-hubs. This kind of stuff is why Tamiya struggles to gain popularity in the US.
Were your atomic LCD's destroying the spool cups? When I saw they were 44mm, I figured that would be the problem.