Gotta keep um original. Please.! Those are in great shape for their age. ( broken or not ) Horn is fairly easy to repair, even when pieces are missing.
Even the real old ones can be saved.
Nothing can replace the originals.
Feel free to PM me, with any questions.
BTW, did you soak them in neatsfoot oil after you cleaned them up. If not, u should..
In this case, no. There seemed to be enough flexibility in the horn. A couple of years back I redid an old Gratian Warranted that would crack just looking at them. Those scales soaked for a couple of weeks.