Stem for unishell case and cal. 431 movement

I’m looking to buy a stem for a vintage Longines cal 431 that has a unishell case. Would the stem in the listing below work or is there a different split stem that’s needed for unishell cases?

Thanks!

EDIT: given that it's a unishell case, the stem would have to be two piece - does anyone know the part number by chance?