1940s-50s Aftermarket wiper question:

I bought a set of aftermarket wiper arms and blades for my 1950 Dodge Wayfarer and have now given up on getting any docs or instructions from the guy I bought them from.
This my be a simple question, but I can't figure out how to mount the blade on the arms.
I'll try to describe them, but I can also send some photos to someone that might recognize them.
The blades have a figure 8 or B looking device with one of the ovals opened on the 8 giving it a hook type appearance. The arms have a slot in which the blade looks like it would fit, but upon installation it wobbles too much. There are also some small pins included, but I can't see where they would fit.
Anyone recognize them?

Thanks Streets, here try this (hopefully):