Yes, 2014 model. 2014 has a few nice upgraded, so if you are buying, ask for the 2014, there are still 2013 sets out there I think. 2014 has a couple extra grease zirks, different (softer?) tire compound, and three bearings in oil instead of two in grease, on the main shaft. May have a longer warrantee also, not sure about that.
I read Dirtwheels for years too! The commercial stuff is way too expensive, so I came up with this myself. I built the ski legs and adapted them to some camoplast molded skis, with homemade wear rods. and the rear has tires of course, cause the track sets are too much money (for a quad). These are Mud Machine tires, 10 inch wide, run really low on air, like 0.8 psi. and the rear track is set as narrow as possible using all the options available (hubs on outside of rims, rims offset inward, etc. Don't ask me to tell you why (I could guess), but after much experimenting I have found that narrow gives noticably better traction compared to wide.