Guys, I purchased this sled used last year. I think it still has the origanal skis from the factory. My problem is I purchased new carbides to fit the factory ski and they are not even close to fitting. The new carbides are woodys and I purchased them from Dennis Kirk. Does anyone know how many stud holes are in the factory skis? Mine have 6 holes in each ski and the new carbides only have 4 studs for mounting.