I'd like to swap the rear seat cushion from my 1991 560 SEL with one from a 1991 420 SEL since the leather on the 420 seat is in much better condition than the 560. The 560 rear seats are power recliner and are heated while the 420 is not. My question is this. Can the 420 seat be made to fit and retain the heating and reclining features or are the seats totally incompatible to thye point that it can't be done?

J.Chip