I wouldn't swear to it, but after looking at the "CaptJack" site it looks like that "A32" is the same as for the Retina II/IIIc, as Steve Beyer said. If so, they are seen on ebay fairly frequently, although I looked just yesterday for one and only found a rather overpriced offering. I can't remember how much I last paid but around $20 comes to mind. Be patient and you'll find one.
With kind regards, ed.