This is a pressure plate kit for all BDL clutches. Can used with any BDL closed or open belt drive with clutch. The Ultimate Clutch will let you choose between a diaphragm or regular coil spring set-up. Diapragm in Black for stock; the Copper color for high performance and both for very high performance pressure. For the coil spring-setup you use 4 springs (stock) and add springs as your application requires or changes. Maximum is 12 springs but most high performance will use only 8 or 9 springs.