Nut - .668-20 Hex x 15/16" AF x 5/16" 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)