got the same problem with my 2a original stud part number 561590 is the screw in one 561886 is the knock in one then you can use the original wheel nut and a 9/16ths drill bit to drill the hub. should have double checked the thread in my hubs before i ordered new ones from craddocks ordered screw in ones but the thread is fubared on 2 of them so will be replacing them with knock in ones