I don't think anyone makes a reproduction anti-sway bar for the early B-body cars. But you can bolt on the B2 style without too much work.
www.firmfeel.com is a good place to work with for that.
I had some pictures in my B-body book on the subject and provided a list of sources for parts. You can get the book from Amazon for less than $20 and it will answer a bunch of questions like this.
On my '65 Coronet I went with an aftermarket bar that was attached to the strut rods. I did it this way so I could clear a wider tire.