Thread size?

Replacing Rear wheel bearing on daughters TF had to split the nut to remove it on the rear track control rod end - the long one across the back of the car. The end that looks like a track rod end.

So need a new nut. It seems to be an odd size and quite a fine thread.

I've tried 12mm and 1/2" UNF - neither of those.

I'll bet I can't get one on it's own, probably going to have buy a complete rod end. Anybody any ideas on what thread this is?

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