Oregon Blades - 396719. These blades measure: width 3'', thickness .250'', length 18-15/16'', center hole 13/16, offset 1/2'', air lift 1'', color black. SET OF 9 BLADES. Tungsten carbide is "fused" into the blade creating an ultra-hard layer at the cutting edge and increasing the time between sharpening. This fits John Deere part #'s and models listed below: M143520: Compact tractor models: 1023E, 1025R, 1026R, 2210, 4010, 4110, 4115, 4210, 4310, 4410, 4510, 4610, 4710, 2305Riding mower models: GX255, GX325, GX335, GX345, GX355, LX280, X465, X475, X485, X495, X575, X585, X595, X700, X720, X724, X728, X740, X7488, X748, GT225, GT235, GT235E, GT245, LT170, X320, X340, X380, X384, X390, X394, X5000, X520, X530, X534, X540, X570, X580, X584, X590, X750, X754, X758Ztrack models: Z375R, Z425, Z435, Z445, Z525E, Z535M, Z540MM145516: Compact tractor models: 1023E, 1025R, 1026R, 2210, 4010, 4110, 4115, 4210, 4310, 4410, 4510, 4610, 4710, 2305Riding mower models: GX255, GX325, GX335, GX345, GX355, LX280, X465, X475, X485, X495, X575, X585, X595, X700, X720, X724, X728, X740, X7488, X748, GT225, GT235, GT235E, GT245, LT170, X320, X340, X500, X520, X530, X534, X540, X570, X580, X584, X590, X729Ztrack models: Z425, Z435, Z445M152726: Compact tractor models: 2210, 4010, 4110, 4115, 4210, 4310, 4410, 4510, 4610, 4710, 2305Riding mower models: GX255, GX325, GX335, GX345, GX355, LX280, X465, X475, X485, X495, X575, X585, X595, X700, X720, X724, X728, X740, X7488, X748, GT225, GT235, GT235E, GT245, LT170, X320, X340, X380, X384, X390, X394, X5000, X520, X530, X534, X540, X570, X580, X584, X590,Ztrack models: Z375R, Z425, Z435, Z445, Z525E, Z535M, Z540MSunbelt models: B1PD1054, B1PD5054Thanks for looking!