Looks like your rubber boot has disintegrated on the wiper shaft nut. It should fit snuggly and that washer hose is outside of the rubber boot. It presses on to a tiny pipe that penetrates from the under side. It shoulg look like attached photo.
You can go to Thor or some dealership with VIN and so forth and they can drill down through all the parts diagrams until you find it.
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ComputerChips
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