The part that is rusty is called a rad support, it bolts in and is available aftermarket, it is a fair amount of work to change it but its not an overly hard job, just time consuming. It is a very common area on those trucks to rust.
Hope this helps, if you have anymore questions feel free to ask and Ill do my best to help.
Hope this helps, if you have anymore questions feel free to ask and Ill do my best to help.