I'd imagine very, very difficult to find exactly the correct ones from a correct ref watch.
I think if I were you I'd be somehow looking to buy a period correct vintage Seamaster dial with the same/similar shark tooth markers and switch the whole lot. Obviously you'd need to do a lot of homework first regarding size, colour, fit, finish, application method, as well as checking the back of the dial etc to see how your markers are now applied, etc...
Bump 馃榾 any ideas where to find some ? (Before asking a refinisher to make new ones)