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That is the optional "See Clear" windshield washer foot pedal and diaphragm. My 55 F350 has one. It was missing the bottle and hoses. I bought a bottle from MidFifty. You should have a nozzle on your hood.
Pics of mine: What mine looked like when I got my truck
here's a more recent pic with the decal on the bracket.
Krout, your original firewall pad looks to be in good shape.
Thanks Abe, Never saw this set up before. All the related parts are long gone including the hood nozzle, (Not from me but previous owners ). How well does it work ? I might think about hooking it up again. And yes , the firewall and engine compartment are still in nice shape