Bee, I don't get what your saying? Go to Shade Tree and look it's not the snow tracker extreme they're carbides made by snowtracker for OEM and Kimpex Arrow which takes the same carbide as Doo precision skis. So what I have is a six inch standard bar on the outside and the Snow tracker six inch on the inside. It's not overkill and I tried it on my 09 Vec first with the standard six inch for Arrows and I had some push in the corners, added the Tracker six inch and no push at all. Rode my 07 yesterday without the tracker and had some push in the corners and will add the Tracker today to see the results.
I'll post pics of the set up and a pic of my standard Yamaha skis with the Snow tracker extremes and show you why they're dangerous...I had one hook onto a railroad crossing and throw me off the sled, they work great on groomed trails but have their drawbacks and I won't take that chance with my kids riding these machines.