Duster Seats In a Valiant?

Well actually I guess my question is........... Do you have to do any modifications to mount a 74 bench seat with the 2 individual backs and armrest into a 72 duster? And would it bolt right into my 69 Valiant? I'm guessing by all of the replies that it will. I just don't know if the 72 Duster was modified at all to accept them. It's getting fully sandblasted and painted. My friend has a slightly worked 340 wrapped in plastic for months waiting.....prob still wait another 6 months or so I'm guessing:(