Drive Shaft questions.

View attachment 137466 Ok, I am trying to figure out what the difference is between these two drive shafts. One is from my 68 Fury III 4 door, and the other if from my 68 Fury III 2 door fast top.
One is clearly smaller and longer than the other by 1/4 of an inch or so.
Does anyone have any ideas as to why?
Is one of my rear ends different?
I'll try to get pictures of both gearboxes for further reference.
Author: Progrocker74