New 5 blade fan has a 21" diameter, 1.5" pilot hole, and 8 mounting holes on 1" centers. This fan fits multiple John Deere Tractors. Dim A (1) 21" Diameter Dim B (2) 1 1/2" Pilot Hole Dim C (3) 8 Mounting Holes On 1" Centers John Deere TRACTOR: 4000 John Deere TRACTOR: 4010 John Deere TRACTOR: 4020 John Deere TRACTOR: 4230 (W/O AC)