Speedometer cable

I appreciate all the replies. I think I can get a correct cable with the information that we have talked about, but now we need an answer about the two different sizes. Has anyone ever actually seen a transmission with the smaller 5/8 thread on the speedometer housing? I am starting to think that chrysler never even made it, but there are just a bunch of incorrectly built aftermarket cables out there. The other thread I mentioned earlier was started in 2012, and we are still running into this problem. I think it is time that we finally solve this problem.