I have a set of used 99 ACR suspension for sale. They were taken off a car with 10,000 miles. This is the best ACR suspension, Koni shocks with the internal reservoirs, triple adjustable. They have Hypercoil springs, I believe 400 on the front and 700 on the rear, factory set up. I was going to put them on my car, but decided on something else. $1,800 takes it. This works on any year GTS or RT/10 97 and newer.