It should interchange The only problem would be if the shift rod isn't drilled all the way through. It's been so long since I have changed one of the old ones...But I think they are drilled. As far as checking to see if the pan is newer than a 64. Check to see what front end is under there. If it's a ball joint unit it is 66 and later and most likely the 71 that the registration states. If it is a link pin front end...The first thing I would do then is check to see if the serial number on the pan(right in front of the hole for the coupling) is the same as what is on the registration. One other thing now that I am thinking back is has the pan been shortened to fit the car? If so then the quick fix for the shift rod was to use the old coupler on the cut off shaft. This would also explain the old coupling on a 71 pan.
66 Ghia 76 std Beetle
It's not a car it's a VolksWagon