The short length of wide trim that goes from the end of the gutter to the bottom of the rear screen trim is held by 3 clips, These can leak water down the inside of the wing into the wheel arch junction. It's not uncommon to see a rust bubble on the outside at the peak of the wheel arch lip and that is caused by this leak. The clips are hard to get at but should be sealed with the equivalent of dum-dum as per original. Leaks from here can also get down into the spare wheel well. Best to leave the drain hole open if that is the case but if always dry you can use a sealing grommet.
Also make sure the seal for the number plate light is good as water flows down the lid and through the mounting holes.
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