Same Coil Spring?

Please tell me if the rear coil springs of a 1981 Pontiac Bonneville are the same to a 1981 Lemans, 1981 Grand Am, OR a 1981 Grand Prix?

I would like to put in some Air Lift Bag Springs into the rear of my car to lift up the back end.

Thanks,
Jerrett

Any air shock will lift the back end without messing with the springs if all you want is some ground clearance. You can also get overload coil springs to sit it up a couple inches for like 30 bucks.