Coupling 5 spline 10

HandyMelT

New User
Has anyone else searched for the rear drive shaft coupling pn 189469M2 ? I found several M1 parts but can not verify compatibility. I found Ace Equipment in Blackshear GA but so far no call back. I see the available coupler on YT is 3.750 but the OEM is 5 in length. I have a 1978 MF 245, sn 9A 288409 that needs the part, it snapped at the rear shear section. Thank you.
 
I'm almost positive that M1 and M2 are interchangeable - at least as far as design & geometry. See link below where it's discussed.

Same part and design, possibly an update to the mat'l spec's. I know I've used M2 parts where the parts book listed an M1.
M1 vs. M2 Part Numbers
 

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