HIGH PERFORMANCE EXTRA PLATE KIT Buell XB9 and XB12 2003 to Present. Kit includes 8 friction plates with race proven friction material on tempered steel cores. Starburst groove pattern for maximum heat dissipation and oil circulation. Included are 7 tempered steel drive plates. Preset stack height for easy installation. Includes 15% stronger diaphragm spring. Provides more surface area over stock kit.