This is a A-R100939 Gasket, Clutch Housing To Cylinder Block PN: R100939Main Description As Following : A-R100939 Gasket, Clutch Housing To Cylinder Block PN: R100939 Found in Section & Models : Transmission & Rear Axle > Gaskets: Trans and Diff, John Deere TRACTOR: 4050 (SN 006510> W/ 6466D Engine), John Deere TRACTOR: 4055, John Deere TRACTOR: 4250 (SN 011346> W/ 6466D Engine), John Deere TRACTOR: 4255, John Deere TRACTOR: 4450 (SN 022619> W/ 6466D Engine), John Deere TRACTOR: 4455 Associated Items : New Also This is An Aftermarket Product And : Replaces: R83987, R99287