Wiper gasket

I'm finding out all the minor things i need to do to my 66 econoline.
One of them is windshield wiper bezel to cowl gasket's.
My question is what tool do you need to take of the arm and pivot nut?
thanks

The arms just pry off ,just have to be careful use some rags to protect the paint.For the chrome nuts I just cut a notch out of a flat steel bar wide and deep enough to go over the nut the ends insert into the notches on the chrome bezel, a cresent wrench on the other end of the bar turn em off.

Can you give pics of what you have. This is something that I need to be looking at also

https://i.servimg.com/u/f44/17/54/82/24/photo_10.jpg
Here is a photo.
I need to put a gasket so water stops leaking down to the floor.