These coilovers are made by GAZ in England. We send them 240 spindles and the weld their gold series coilover to it. They have adjustable rebound and are valved to suit. These are the best setup we have used, no made in China stuff that looks the part but under performs. We have spring options from 300-500. Let us know in the notes or contact us to find out/let us know what you need. If you have specific needs we can custom make coilovers for your needs.