Mike,
And you wont that I know of...HOWEVER try reading page 422 in the February 1930 Ford Service Bulletin for starters.
There were five (5) different lengths of the Light Switch Handle and Horn Switch Assemblies, page 517, December 1931 Ford Service Bulletins, so maybe there were 5 different column lengths.
Sounds like a great research article for you to do!
Pluck