MTD 51125-103 — Replacement blade fan (fan assembly). Exact-fit replacement fan that sits above the blade on 21‑inch (≈533 mm) cutting decks; restores the deck’s designed airflow for proper lift and grass ejection. Listed in the LM‑5360 parts diagram as part 51125‑103 and commonly used on Danarm/Kaaz/Lawnflite/Cobra 21" mowers (LM5360 series and like models). Fits LM5360 family machines (examples: LM5360HXA, LM5360HXAR, LM5360KXA and other LM5360 variants) and equivalent Cobra/Danarm branded 21" rotary mower decks.