This is a A-3795499M1 Disc, Brake PN: 3795499M1Main Description As Following : A-3795499M1 Disc, Brake P.N: 3795499M1 A-3795499M1 Disc, Brake P.N: 3795499M1 Found in Section & Models : Transmission & Rear Axle > Brake Disc and Plates, Massey Ferguson TRACTOR: 5475, Massey Ferguson TRACTOR: 5480, Massey Ferguson TRACTOR: 6270, Massey Ferguson TRACTOR: 6280, Massey Ferguson TRACTOR: 6290, Massey Ferguson TRACTOR: 6465, Massey Ferguson TRACTOR: 6475, Massey Ferguson TRACTOR: 6480 Associated Items : New Also This is An Aftermarket Product And : Outside Diameter: 13.50" Spline Count: 14 Spline Diameter: Major 3.430"