The single keel skis used by Yamaha on most models from 03-10 can now be retrofitted to fit the Sidewinder, Viper and SR venture. This provides a budget friendly solution for those wanting to ditch the tuner skis. These skis work excellent with snow trackers for groomed trail riders. The mounting hole in the saddle is too low to fit the Cat spindle, so we machine the saddle a bit and then install some offset bushings to raise the mounting hole. Red, blue, black and yellow loops are available. Retail will be $160 for a set of skis ready to bolt right on.