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I put a little silicone on the 2 holes that werent used... worked for me and have never seen a leak and its been quite a while, but dont drive it in the rain just going off from washing...
Same and I've never seen any water drips coming from the hole. Kind of like if it ain't broke...
same deal. i did nothing and it is working out fine. though i can't say i drive my car in the rain often. if it does start to drizzle, i head back home and switch it out with the spare car