hey now,
i believe them to be sprint springs, but here is a picture of my old car with them on, i did not swap them over to the "new" 396 car because i wanted a air ride set up but i never rounded up the money.
these make the car look cool and they handled great (compared to the eibach pros i have in the 396). these pictures are with 17 x 9 1/2 in rims so if you have 17 inch rims your car would be at the same height. i also had the airbags from the previous picture installed as well.
i forgot how cool a low impala looks, i need to get my act together and buy a air bag set up.
and if you want them it will be $80 total thru paypal shipped to your zip code, let me know.
thanks,
dave