Integrated Shoulder Belts, front and back?

Has anyone here ever tried using the seats out of a Chrysler 200 convertible as replacements in their A-bodies?

I have seen the Sebring swap a few times, but am not a fan of how high the shoulder belt pillar is where it is as tall as the head rest. The 200 Seats have a much more understated setup that I much prefer in terms of looks, but I am wondering about fitment.

Also - I haven't really seen much about back-seat updates using modern setups to give rear-seat occupants (read kids) shoulder belts and head-rests. Given that the A-body back seats are pretty narrow (it looks downright tiny in my Barracuda), I'm wondering if anyone has come up with a swap-in solution for head-rests and integrated belts in the rear?