tie rod differences in size 67-72/ 73 up

[ChevyRacefan]

Hello,
I have read that the 73 and up IIRC tie rod shaft that goes into the knuckle is a different size, taper than the 68-72 trucks.
What is the size difference.
I got a set of drop spindles but don't know what type years tie rods are used with them.
I assume the difference is big enough that measuring the widest part of the tapered hole, will give me a match.
I guess I could get both and see, but I would think I can measure and get the right ones without doing that.
Thanks for any help.