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Original Equipment 3 Mower Blades – M127673,3 This fits riding mower models: GX255, GX325, GX335, GX345, GZ355, LT166, LT180, LT190, LX280, LX289, 325, 335, 345, 355D, X465, X475, X485, X495, X500, X520, X534, X540, X570, X580, 590, X710, X750, X754, X758, X575.X585, X595 X700, X724, X728, X729, X730, X734, X738, X739, X740, X744, X748, X749, S240, STS18, X300, X320, X310, X324, X350, X354, X360, X370, X380, X384, X390, X394, X940, X948, X949 Ztrak models: 717E, Z355E, Z355R, Z425, Z435, Z445, Z525E, Z535M, Z540M Walk behind models: 7H17 This is a genuine part. Thanks for looking!