I don't have specific guidance however I suggest to go to a website such as crutchfield and search in particular for "marine" or "boat" speakers as they have cones made of a material that doesn't get damaged due to moisture (water or rain for example) and I would only purchase that type of speaker (vs speakers made for cabinets and dry locations). Also, crutchfield has guidance for the physical speaker sizes that can help you match in size what you already have. ~CA
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2010 GreyHawk 31SS
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