When ordering axles, the following information should be helpful to you. EX: 20545I-ST-EZ 2,000 lb., 5 on 4 1/2" Idler Straight with E-Z Lube 20 / 545 / I / ST / EZ 20: The first group of digits represent the capacity (20 = 2,000 lb. capacity) 545: The next group ...