I have the factory turn signal on my 57. I would think it would work on any column of the same diameter. Sorry, I dont know what that measurement is. Keep in mind that there is a raised area at 12 o'clock on the column that the assembly slides over to keep it from rotating on the column.(if I recall correctly). I guess you could fabricate something. I've been wanting to rebuild mine, do you know of a vendor who sells parts for these? If not I might be interested in replacing the whole assembly. And the cancelling ring is on the back of the steering wheel. I hope this helps.
Jeff

"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."

1957 GMC 150