Hmmmmmmmmm,,,,,,
That splined joint is susceptible to rust. The Mitsubishi MT 372 had a similar spline on the mower drive, it is also a diesel.
When I had the MT 372, I used to disassemble and grease it EVERY year, my splined joint survived well. The MT 372 part is also a NLA. A lot of MT 372s' are DOA because of the unavailability of that part.
It might be worthwhile considering a grease fitting on the adapter, for that reason.
