They will not fit to Plymouth Furies, Dodge Polaras and Monacos because Chryslers had a longer wheelbase. Imperials are so different from the rest that you don`t need to think about fitment to one of them. As I am aware of T&C has a bit shorter wheelbase than other Chrysler models. In this case: 66 T&C: 121`` and others 124``.
Are you sure about that?
Chrysler typically made different wheelbases by using different length rear footwell pans and rocker lengths.
Rear rails are usually identical between all bodies in that family.
67-76 A bodies rails all interchange between the 108" and 111" wheelbase.
70-74 E body rails all interchange between the 108" and 110" wheelbase
66-70 B body rails all interchange between the 116" and 117" wheelbase.
C bodies are most likely the same 65-73.
You are correct about the rear stub frames, but they are the front stub frames that do have differences. For example Imperials from 69-73 are on a wheelbase of 127 inches, other Chrysler model are on 124`` and the T&C is on 122`` which is the same as C-body Dodges. When we move to Slabs, Imperials are on 129``, Chryslers
on the same 124`` wheelbase as the T&Cs are built on 121`` WB. Slabbie Dodges are on 122`` and Furies on 119``. Fuselage Furies got a wheelbase measuring 120``. To back up my statement: The 1970 Hamtramck Registry Home Page.