Many years ago I used the rear coils out of a Volvo sedan(IIRC).They were dual rate,kinda long and the part I liked best(over say aerostar coils) was they were narrow in profile...like 4 or 5" across so they didn't take up a bunch of room. I tried a bunch of different coils and those were by far the best...ran them till I took the car apart.......A truggy XJ