New 6 blade fan has a 16" diameter, 1.5" pilot hole, and mounting holes on 1.75" center. This fan fits the John Deere 2510 and John Deere 2520. Dim A (1) 16" Diameter Dim B (2) 1 1/2" Pilot Hole Dim C (3) Mounting Holes On 1 3/4" CentersJohn Deere TRACTOR: 2510 John Deere TRACTOR: 2520