Hello, I have finally pulled my inner heater box out to replace a leaking heater core...and noticed the plastic duct work that sends heat to the windshield is broken (See attached photos), and a big chunk is missing. Is this part critical? I JB welded it so it will at least attached to the metal box, I am looking for a replacement. Does somebody have this part? Thanks in advance!
~Dave...

 

Why not just make one out of metal. Looks easy to do then paint it black. Its just a deflector.