just wanted to post this as an information type post. i had some issues with my drivers seat, seat bottom spring was broken and leather back rest was worn at entry point, i had an extra passenger seat with good donor parts.
the leather drivers seat bottom, back and springs are interchangable with passenger side. so i was able to use the good passenger seat spring and the leather seat back to replace the worn items i had on driver side. the seat now feels new. all took about 2.5 hrs to change over, and was relatively easy.