1991 Plus was the only model in 1991 to get the white Canadian non-directional slicers. 1992 White SHO's had the Canadian White non-directional Slicers, as a no cost option. 1993 White SHO's had the Italian directional Slicers, also as a no-cost option. The 1993 white wheels are the ones that are harder to find, since they only were available or one year.