BDL Aramid Replacement Clutch Pack For Harley Features 8 Aramid friction plates on tempered steel cores 6 tempered steel drive plates Starburst groove pattern for maximum heat dissipation & oil circulation Preset stack height for easy installation 15 more clutch area for high performance strokers 15 stronger diaphragm spring. Stack height 1.275 - 1.290 You re-use the stock double riveted steel plate