This listing is for a belt guide, Massey Ferguson part #517978M91.  It was removed from a Massey Ferguson MF-7 lawn tractor, serial #1590001212 with a model 710 mower deck.  It may fit other models as well.  If you are not sure if it will fit on your tractor then please ask.  It is in good condition.  Payment within 2 days of purchase.  I will combine shipping on multiple purchases when possible.  If you are looking for a part that I don't have listed please ask, I might have one.  Thanks for looking!