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That is what is called the air cleaner assymbly. It also has the "Climastic Air Blend Door assymbly, and Vacuum motor attached. You can get the vacuum motor, but not that assymbly.
Junk yard is your best bet. Remember to look at the Econoline vans too. The Trucks from the 1970's to 1981 use this cleaner assymbly. In 1982 it changed. However a newer one out of a 1982-1986 will work, however it will look different and you will need to change the plastic ductwork to the cleaner.