ILENGINE has a good point. Not sure about JD, but Ventrac only recommends specific belts for a number of reasons. They TEST TEST TEST and know which belts work and which ones don't. I had a friend brake a belt after 400 hours on his VT, then went to the local shop and picked up a cheapo and broke it within 30 minutes. Lesson learned. Make sure you buy the belt that JD recommends even if it costs you a couple of bucks more.