I have an older bobcat that I do not know the model number to. It has an old Onan CCK motor that I think re powered it. What makes me question this is it has a sticker that is 500 but doesnt look factory. Also it has 3 pedals which I found stuff on the M600. http://www.skidsteerforum.com/DesktopDefault.aspx?tabid=52&gallerypage=0&path=Unsure%20model%20of%20Bobcat