OEM set of 3 - 2500542 blades
660 / 766 models (22-1/2" blade) 15/16" bore
OEM set of 3 - 2500541 blades
561 / 610 models (21" blade) 15/16" bore
OEM set of 3 - 2500540 blades
354 models (19" blade) 15/16" bore