Steering Box Swap

["Mike H." <twobeaners@earthlink.net>]

Howdy Listers, 
I'm interested in swapping a late Type "B" steering box into a '67 with solid 
column. Using a u-joint with a different splined yoke on each end to fit the 
box and shaft seems to be the easiest solution. 
There are numerous sources for steering u-joints using two different sized 
splined yokes. Can anyone tell me what sizes our splines are for early and late 
models or if they're metric or SAE? 
Thanks, 
Mike Hudson '67-1600