This Cool Dry Cover fits 18" (46cm) ride on mowers such as Toro and select John Deere models. The 18" (46cm) measurement is based on the exterior height of the backrest. The width is 46cm (18") on the seat portion and 42cm (16.5") halfway up the backrest, tapering toward the top. Due to the stretchable nature of Cool Dry Covers, the covers will fit seats with measurements similar to this.
NOTE: This is a seat cover, not a replacement seat.