This is a A-5146036 Disc, Friction, Handbrake PN: 5146036Main Description As Following : A-5146036 Disc, Friction; Handbrake P.N: 5146036 Inside Diameter: 4.126"Outside Diameter: 7.067"Spline Count: 34Thickness: .236" Found in Section & Models : Transmission & Rear Axle > Brake Disc and Plates, Case-IH TRACTOR: MXM120 (SN