PRODUCT DETAILS Replacement bearings for all Crupi headsets. #A83 for Crupi Pro Taper Headset to fit 1.5 LOWER CUP only #ACB38K for Crupi 1" Integrated Headsets to fit both upper and lower cups #418CA for Crupi 1-1/8" Integrated Headsets to fit both upper and lower cups and also the Pro Taper Headset UPPER CUP only #410B for Crupi 1" Factory Std. Headsets to fit both upper and lower cups #TK410A for Crupi 1-1/8" Factory Std. Headsets to fit UPPER CUP only #TK438C for Crupi 1-1/8" Factory Std. Headsets to fit LOWER CUP only #6806-2RS Enduro for US Made Crupi 1" Headsets to fit both cups #6807-2RS Enduro for US Made Crupi 1-1/8" Headsets to fit both cups These bearings may not work with other headsets we stock. We no longer make nor have Crupi's original US made headsets Sold individually