Aftermarket Steering Wheel Hubs, again, but more specifically Options

[lapuwali]

So, I really want to put a smaller aftermarket wheel on my '71 /4, but aftermarket hubs specifically for the '70-'71 steering column are rare. I'm willing to go to reasonable lengths to make this happen, mostly involving modifying a later or different hub to fit. I really don't want to modify the column, and swapping to a later column is not a small thing.

If anyone can answer any or all of the following questions, I'd appreciate it. I'd rather not repeat research someone else has already done.

Are the splines the same diameter and pitch on the '70-'71 v. '72-'76 hubs? I've so far seen conflicting statements which make me think people aren't actually talking about the same thing. In other words, will a later hub fit on an early column at all? Is the problem just the length or offset of the splined part of the hub, or the actual diameter and/or pitch of the splines? Will a later hub slide on and allow the washer and nut to be torqued down, but there's just a big gap behind the hub?

Note that I'm completely unconcerned about turn signal cancellation or the horn. The last several cars I've owned came to me with a broken horn, and my other car doesn't self-cancel, either. I'm used to this. <_<