Ficken's helped me out as well, and I want to give him a plug. I have a '45 and I had purchased some new arms and blades from Carter's. T1hey didn't fit and so I called Ficken. I had an ANCO adapter on the shaft which had a fine spline to adapt a more modern type arm. (Those always fell off at speed) He said take off the splines and-voila- a cross drilled shaft and the ability to put on the wire style wiper arms. They work and stay on now. (I'm glad they never have to move 6" of snow off the windshield) So Ficken's, thanks, and here's the link again.
http://www.wiperman.com/