Welcome to the site, ekfam.
Hmm, does the belt that is currently on the machine now have a part # still legible on it? If so and it were me, I would order that part # just to play safe and know that what I'm getting is going to work.
Perhaps the two different part numbers though are for the same size belt, but listed under different belt manufactures which might explain the cost difference? I don't know, if I had to choose one I'd probably go with the one listed on the tractor itself. Hope this helps some!
Hmm, does the belt that is currently on the machine now have a part # still legible on it? If so and it were me, I would order that part # just to play safe and know that what I'm getting is going to work.
Perhaps the two different part numbers though are for the same size belt, but listed under different belt manufactures which might explain the cost difference? I don't know, if I had to choose one I'd probably go with the one listed on the tractor itself. Hope this helps some!