Watch hands are considered case parts, not movement parts. Yes they have to be able to fit on the posts of the specific movement used, but matching the case considerations is much more relevant.
So for a case ref. 1650003, yellow gold, the sweep seconds hand option is 066UX1371 - it's 13 mm in length (measured from the center post out to the tip, not the overall length).
Note that answering questions like this is much easier if you post close, clear photos of the watch.
Cheers, Al
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