Need Help with a vintage part. Looking for and "Underclasp(?)"

I recently acquired a vintage Seamaster with a Beads Of Rice bracelet. I took it into a local jeweler to add in a link, to fit my wrist and one of the rolled-over portions of the underclasp (the part closest to the wrist when worn that has the Omega lettering on it) broke (the pin that was holding the clasp portions together was degraded and affected this part. I am looking for a spot to find a replacement. I have attached a picture of the part I need. Any help is greatly appreciated!

Is the actual clasp broken or just the pin?

Both

Omega still makes bracelets using that clasp. I should think they could help you. If not, then come back and perhaps we can help.