Vintage Waring Blender parts

I have a Waring blender from the 50's or 60's that is just the base. I would like to get the jar, blade, and lid, but I also need the coupling (?), or whatever is called for to attach to the blade. I don't know exactly what to look for in that part, but from what I can tell, it isn't easy to find.

My blender looks like the one in your picture, but it is very old and has no model #.

I would really like to get this blender up and running. Can you help me? Thanks!

So I request a "crown shaped coupler"? Do you have any photos?