This is a A-R26971 Center Plate, Brake PN: R26971Main Description As Following : A-R26971 Center Plate, Brake P.N: R26971 Dim A (1): 13.250" Dia.Dim B (2): 18 Teeth Crossed From: AMR26971 , , WN-R26971 , , WNR26971 , Found in Section & Models : Transmission & Rear Axle > Brake Related Parts, John Deere TRACTOR: 3010 Associated Items : New Also A-FRM-JD, A-JD-O-OMR32385, A-JD-P-PC736, A-JD-S-SM2038, A-SMJD203 And : Dim A (1): 13.250" Dia. Dim B (2): 18 Teeth