[JLMounce]

I believe some of them are. I don't have a borgeson box so I can't comment on that directly.

Also, in regards to your slop, keep in mind a box will always have a bit of a dead on-center feel. As far as actual slop goes, a big part of that is also in the steering linkage. If the steering system hasn't had an update in quite a while, a rebuild should also be done. That will further reduce the tolerance stack that causes on-center slop.