Three (3) New Aftermarket Blades For AYP Craftsman Fits Husqvarna 48″ Cut Lawn Mowers.Replaces Part Numbers: 173921, 173920, 180054Fits Husqvarna PART NUMBERS: 532 17 39-21 532 17 39-20, 532 18 00-54, 532173920, 532-1739-20, 532-1800-54AYP/SEARS/ ROPER PART NUMBERS: 173921, 532173921 173920, 180054, 532180054ALSO REPLACES PART NUMBERS 539107519, 539-1075-19, 575938201, 575938301, 917173920, 917532173920, 917532180054, 917539107519, 917577203106, 954633774Fits Models: AYP: requires 3 for 48″ deck, GTH2548, LT2323, YTH2148, YTH2448, GTH2548, Poulan: PB20VA48, PB23H48LGT, PB23H48YT, PB23H48YT, PP20VH48, PP22V48, PPLGT2248Fits Models: Fits Husqvarna: Requires 3 for 48″ deck, 2348 LS, 2748 GLS, GTH 2448, GTH 2248, GTH 250, GTH 2548, GTH 2648, GTH 263T, YTH 1848XP, YTH 2148 YTH 2248 YTH 2348, YTH 2448 YTH 2548, YTH2748, YTKH 1848, Z4218, Z4219, Z 4824, Z 5426, CZ 4815, CZ 4817, CZ 4818, Z4818, Z4824