When I originally built my car I had polypropylene bushings and lowering springs. They got old after a while so I decided to restore the elevation and ride quality. Those Moog springs were a good deal and brought the car back to OEM height. My exhaust no longer scratches the road. I installed them into used wishbones along with some professional AC Delco shocks, a Moog Panhard linkage and OEM rubber bushings.