Sorry about the blank reply earlier!!! Noah, X 3 re a Mars bulb. The only thing I would caution you about is the 37R keel, from what I have read, some of the 37Rs had voids in the keel filled with sand and/or filler to reduce weight. I think I would sound your keel with a small hammer to make sure it is solid before you commit to a certain size (weight) bulb. Mars may have records of your boat if they supplied the original lead keel. Also consider the rudder depth, no point having your rudder deeper than your keel or you could find bottom rudder first! Len Mitchell Crazy Legs 1989 37+ Midland On
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