Triplanar Mk VI or Mk VII?

I recently heard a very nice combination of what was asserted to be the Triplanar VII and a SOTA Cosmos table However, it was not quite as good as I had heard from the arm previously, and I'm wondering if I was actually hearing a Mk VI. The owner said that he had purchased the arm on the used market and that the previous owner said that he had bought it new in 2002. I realize that a 2002 date would make it a Mk VI, but since there's some uncertainty, I was hoping that someone could give me description of the differences in the two generations of the arm.

As I am considering buying a new Triplanar for my own Cosmos, I really want to know what I'm hearing before committing to purchase, so my question is…are there any specific ways to tell a Mk VII from a Mk VI by external visual inspection? In other words, what should I be looking for to determine if I was actually listening to a Mk VI?