This is a A-1871924M1 Coupling, Drive Shaft PN: 1871924M1Main Description As Following : A-1871924M1 Coupling, Drive Shaft P.N: 1871924M1 Used when 1683757M91 is used as a service replacementDim A (1): 3.81" LongDim B (2): 1 GrooveDim C (3): 10 Spline Replaces: A-VPH1109 VAPORMATIC Found in Section & Models : Transmission & Rear Axle > Diff Planetary Carriers and Related Parts, Massey Ferguson TRACTOR: TO35 (SN169467>), Massey Ferguson TRACTOR: 231, Massey Ferguson TRACTOR: 240 (ENG. SN Drive Couplers and Chains, Massey Ferguson TRACTOR: TO35 (SN169467>), Massey Ferguson TRACTOR: 231, Massey Ferguson TRACTOR: 240 (ENG. SN