For all those building, or planning to build, the big Gato, IBS (Iron Bottom Sound) has posted correct replacements for the messenger buoys.
You'll have to fill in the scribe lines, on the deck, but you only have to cut a round hole, in the correct location, for your boat, and stick it in. There's a lip on it to insure correct protrusion through the deck. But you may have to adjust it, if you're using a P/E, or wood, deck.
Mike K.