Leveling Box Assembly For Ford Tractor 2N 8N 9N Naa 18 To 21 Inches 8N577A 100% new leveling box assembly meets OEM quality for tractors and farm equipment 1-year warranty covers you throughout planting and harvesting seasons Factory direct pricing delivers an honest value for hard-earned money Replaces OEM Numbers: Ford/New Holland: 8N577AMassey Ferguson: 182642M94, 677061 Specs: Note : Adjust from 18" to 21", Cat I.