I used some spare nozzles from silicone tubes. They can be cut down slightly with a hacksaw, and sealed with a touch of silicone. Put the narrower end into the rubber tube (which leads out through the wheel arch) and then the plastic drain pipe from the sunroof can be fed into the wider end. No purchases necessary... All fixed with junk from the garage.
As others have said, cut off the duck bills and ensure the drains flow freely.
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