Have you checked yumbo-jp.com ?
There's a remote chance they could have it. If so, shipping $$ to U.S. might make you gasp.
The coupler nut part # is:
24312-ZV4-000....joint, shift rod
Probably not what you want to hear but there's a "hardware store fix" for this. And if there's enough rod left hanging in the open you could even do it without taking the shift rod off and then putting it back in.
Is the adjustment nut free and not stuck to the lower rod? What about the jamb nut?
If both of those move ok then here's what you might consider to get it going:
If it were mine, I would get some stainless rod stock and just braze it to the old rod using silver solder. It doesn't even need to be the same size diameter. You could use a close SAE standard size if you want. Then, carefully measure the length you need (double check this with the transmission in reverse) and cut it Then use a die to cut the threads.
If you have the joint nut in hand, you can cut it in half and silver solder half of the barrel nut that threads to your cut threads to that to make a full length nut.
This is a basic fabrication exercise that many can do but I know it's not for everyone.
Quality silver solder is strong, rust resistant, doesn't need flux and is easy to work with. A simple propane torch is all that's needed though I prefer oxy/acetylene. It's not cheap like plumbing solder but it does waay more. Available at welding shops. If you're lucky, they will sell you a couple of sticks...which is more than enough for a little practice and then brazing your joints.
For positioning your rod piece, drill a shallow hole in the end of a section of 2x4 and stick the piece in there. Prop it up to match the shift rod end and braze.
You could try calling this guy...
Tim's Outboard Repair
218-682-2331
Others here have found parts through that shop.
Good luck.
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