I put newer bucket seats in my 1964 Valiant and 1965 Dart. Reasons were to get a shoulder belt and much cheaper than ~$700 for new foam and seat covers. I used Sebring w/ integral shoulder belt in the Dart ($100/pr) and Cobra convertible in the Valiant ($50/pr). Both sets have a driver's electric base. Try to find seats w/ flat bases and don't be afraid to cut the base and surely need to add braces. Will likely need to drill a few holes in the floor, but those could be filled if you ever want to go back to stock. Try to use the existing mount holes since those have backing and use thick washers underneath otherwise. Many people do this. I am sure w/ all the full-size SUV's you could find some wide enough for a C-body, and many today have integral belts. In my 65 Newport, I recovered the bench seats ~1996, using covers made to size from a place in LA (forgot name). They had patterns going back to the 1930's.