New 6 blade fan has a 24" diameter, 1.5" pilot hole, and mounting holes on 2" center. This fan fits the John Deere 4430 and John Deere 4630. Dim A (1) 24" Diameter Dim B (2) 1 1/2" Pilot Hole Dim C (3) Mounting Holes On 2" Centers John Deere TRACTOR: 4430 John Deere TRACTOR: 4630