Been searching for inner fender wheel well for the dually.
I've run across some older threads on the internet with links but they're all dead and links are non-existent.
Any leads?

 

There are one or two things you could do.
Call the nearest dealership, provide your VIN and they should be able to tell you the part # and price and get one for you. After that you can try other means to locate one. Some times it is faster and better to go to the dealer than order what you hope will be the right part sent to you and if not , now it results in higher cost than if you bought it ONCE from the dealer.. Specialty items can get really messed up buying on line.