Used on acft eng j79, j85, t58, t64. xmatl AMS6470; dia 1.560-1.580; width 0.324-0.326; 1st end counterbore dia 1.185-1.189; 2nd end counterbore dia 1.345-1.350; 1st end counterbore width 0.040-0.050; 2nd end counterbore width 0.139-0.149; ring, mating gearbox oil seal