This happens a lot on other ATV models. Some have used two rubber "washers" between the bulb and the assembly to make a tighter seal; some have sealed the bulbs with silicone. What I do is when I get mud in there I wash them out with windshield washer fluid as soon as I get home. Sooner or later the reflective properties of the housing will be lost if the water/mud is not stopped from entering.
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