I have several sets of Simmons skis. 1 set has Ysmaha "V" mounts and the other has Yamaha "V2 " mounts. They are identical except the v2 style has 2 holes, fit mounting the Shia mire forward of the spindle, if desired. These mounts fit Apexes, Nytros, and trailing arm Yamahas I know for sure. I've also heard Simmons makes a mountain sled mount got Yamahas. Not sure what difference would be with that tho. Maybe that's what you have?