Wiper Blades

[Moparfiend]

I found my wiper arms. They never had blades on them. They are Anco made in the USA. Were these the originals? Also what type/size of wipers do I need for these? They look like some type of press fit since there are no holes or barbs etc on the end.

 

[Moparfiend]

Ok after some more research I believe this is called a bayonet and it looks like 15”. It even says 15B on the arm.