Does anyone know the length of a proper minute hand for, say a 2998?

http://www.ofrei.com/omega-watch-hands-caliber-321-861.html

Says that the service hands are 14.2mm. I imagine these are the FOIS hands.

 

I would say the sales description is downright fraudulent. NOS implies old stock no longer in production. If these are still being produced by Omega, then these hands are not NOS and are not at all rare.