Jack’s has Universal application replacement idlers in many sizes, including flat idlers, heavy duty flat idlers, heavy duty v idlers, no flange flat idlers and v idlers. Just use the drawing and measurement provided under each category to get the right size idler.
It is important to know that idlers are not the same as pulleys. There are parts called idler pulleys, but they are actually pulleys. The difference is that a pulley will have a notch (or some other device) to fix it to a shaft that it rotates around, while an idler rotates freely around bearings at its center. Click here for Pulleys