I have this 19j, Illinois with a missing bow. My question is: are replacements available for this and does it require a special tool?

info from case back

Fitting a good wire replacement bow is pretty easy when you have the parts and a bow pliers. For one of us to help you get a bow, we need you you to measure the width of the neck where the bow will "socket" into the two holes that hold it to the neck.

The measure is .492 inches. That is the outside, not inside the sockets. I have another that is .416 in.