This is a A-235103A2 Coupling, Reversible 540/1000 RPM PTO PN: 235103A2Main Description As Following : A-235103A2 Coupling, Reversible 540/1000 RPM PTO P.N: 235103A2 Inside Diameter: 1.530"Length: 4.730"Replaces: 235103A1Thread: 1 3/8" - 18 UNEF RH Replaces: 235103A1 CASE/INTERNATIONAL HAR. Found in Section & Models : Tractor Parts Associated Items : New Also This is An Aftermarket Product And : Inside Diameter: 1.530" Length: 4.730" Replaces: 235103A1 Thread: 1 3/8" - 18 UNEF RH