MaxPower 331737B mulching blade for a 21" Cut Craftsman/Husqvarna/Poulan replaces 008020, 159267, 165833, 175052, 175064, 176135, 189028, 406706, 406712, 406712X431, 531300765, 532175052, 532159267, 532165833, 532175064, 532176135, 532189028, 532406712, 539111878 & Pp23020 this blade measures 21" Lo...