There are 2 locations for the body tags.
On early cars, the 3 were mounted on the horizontal shelf-part of the "fire-wall". The location was on the right side, about 1 foot inboard.
Later, they were moved to the vertical surface of the "fire-wall", dead center.
I believe that the change was do to the heater.
The heaters were dealer installed, and they could be installed in two ways. One had the inlet/outlet tubes pointing forward through the fire-wall. In this fashion, one could readily see the lever to go from heater to defrost and one can see the front face of the heater with the KF decal. Convenient somewhat but it encroached on foot room for the passenger.
The other instalation (rotate the heater 90 deg.) had the heater tubes pointing upward thru the horizontal surface of the fire-wall just where the 3 tags are located.
This installlation aforded more foot room, but operating the lever was a blind operation and one could no longer see the front of the heater. Additionally, the dealer had to relocate the 3 tags.
I believe the plant relocated the tags to accomodate either heater installation.
Make sense??