No — the MTD Lawn Tractor Triple Bagger (for 50"/54" decks) will not fit a Husqvarna TS 154X. Husqvarna tractors require Husqvarna‑specific bagger kits, and the MTD system is engineered only for MTD‑manufactured brands (Cub Cadet, Troy‑Bilt, Craftsman, Bolens, Yard‑Man, etc.).