Dave, thanks for your response. I guarantee you that it's not 13-1/2 inches. But I can understand your skepticism, I took it to several local hardware and window dealers and they had trouble believing it even when the part was right in front of them. The hardware people all said I had no hope of finding a replacement. The window dealers all insisted I had to install a new window.
I think your suggestion of a 9-1/2" operator as a substitute is a good idea, and a lot cheaper than replacing the window. Moving the track would not be a problem. Thanks a lot for your time, I appreciate it very much.
Robert
Of course, Robert, I was happy to help. Let me know if you have any further questions!