Part NumberTractorSeriesReplaces : Equal Arm or old style 35N, 55N 4GZM1391.375-6248035N CV or CAT4 * 1.375-6 4GZM2391.375-21248035N CV or CAT4 * 1.375-21 4GYM1401.375-6258055N CV or CAT6 * 1.375-6 (#19556800) 4GYM2401.375-21258055N CV or CAT6 * 1.375-21 (#19656800) 4GYM3401.750-20258055N CV or CAT6 * 1.750-20 (#19756800)