Our clutch spring conversion kit for the 1998-10 Harley Davidson Big Twins includes a CNC machined 6061-T6 billet aluminum pressure plate and two sets of six heavy duty coil springs. Designed to replace the stock diaphragm spring and pressure plate, this spring conversion kit provides a smoother, more controllable clutch engagement. The two spring sets of different tension ratings allow for three different spring pressure options making it ideal for stock to high performance applications. Installation is 'bolt-on' with no modifications required. A hydraulic version is also available.