Nut - .668-20 Hex x 15/16" AF x 7/16" Thick - Delco & Ford "1G" & "2G" Alternator Pulleys; Delco Generators (7058, 7068, 7069, 7080, 7705, 7711, 7712, 7742, 7748, 7749, 7750, 7751, 7752, 7753, 7755, 7756, 7760, 7764, 7765, 7768, 7769, 7770, 7771, 7774, 7775, 7776, 7777, 7784, 7790, 7791, 7792, 7793, 7794, 8258, 8267)