Just look at the pictures.
Yes, the 68-72 pitman and idler have a more significant drop, but the center link sits on TOP of them. The 73-76 pitman and idler appear to have less of a drop, but the center link is BELOW them.
Look at the pictures in post #57. The center link stays at basically the same height. It has to, otherwise the steering geometry would have changed from 67-72 vs 73-76.
And "steering linkage" has to include the pitman and idler, because you can't mix and match 68-72 and 73-76 steering components. You have to use the pitman, idler and center link from the same year range because of the change in the direction of the tapers.
The problem isn't the 73+ linkage.