Your throttle lever resides in a slot in the dash. The lever should make use of almost all of the slot if everything is in proper order.
Once again, this is a situation whereby you consult the parts manual for your tractor and make a comparison between what you see on your tractor in the way of parts and what you see in the parts manual. Previous owners often do silly things, such as substituting parts that are not correct for your tractor. No one is likely going to tell you what is wrong because they can't see your tractor. But you can see it and you can also see what the parts manual is telling you. :thumbsup: