65 Dart, any modern rear seats that fit good?

I don't care to reupholster my front or rear seats. I look on craigslist and I keep wondering if I could use the rear seats (maybe even the fold down and the arm rests) of another car. I keep seeing a lot of BMW M3 seat sets and "me likey lots"

I'm not worried about how to get the fronts in. I would imagine its a lot more work to get another cars rear seats into the rear of the dart... width is a consideration and mounting points and the fear of leaving huge gaps after putting in the new seats.

Has anyone done this?