Thoses springs are for their coil over systems. I'm pretty sure you could make a set work in the impala. I have a set of Air Ride Technologies coilover air bags for the Impala. same setup. I called QA1 a few months ago and asked about this. They said there was a problem with spring rates or something to that effect. The shocks are awsome though. I have them on all 4 corners. I wouldn't give them up for anything. Atually call Summit or Jegs and ask if they have the QA1 shocks. They are the same shock,for the front any way, as I belive a nova. Ask them what else they fit and you can find a coil over system that will work with these cars using a different spring rate. I think the front is a 420 and the rear is a 400, but ask ED I'm pretty sure he knows what they are.