Not really. Thought about this myself back in the day (2002). The saloon has a fixed back seat, not folding like the coupe, but I was pretty confident it could be done. When I went for the leather retrim I took along a saloon rear, just the seat back, (cost me £3 from a scrappy), but the trimmer wasn't happy with it, so in the end he removed the headreasts and fitted them to the coupe seat back.
Tried to include a photo but been having problems. Look at my pictures in ongoing projects, there's one there.