Since we are showing off wagons. My buddy has a 91 model, Impala SS Clone. 3/4 drop... it doesn't look that low, but it really is.... frame only has a couple inches before it hits and he scrapes on everything with the back end.
He got into a fender bender with a mustang a while back and had to order a new bumper. Most are still available but low in supply and mostly fiberglass. If you like the smoothy style like his let me know and I will get the info, he got in touch with the guy that manufactures them and he still had some of the poly-urethane smoothies still. Buddy got it at a discounted price and shipped directly to him, said it was folded over onto itself and shoved in a box, laid it out for a few days and its perfect.
If you get the extra, also get a rear roll pan, the rear factory bumper is hideous on them and a roll pan that is flush really sets the car.