I saw some extra floatation on a Tracker aluminum boat the other day...looks like what you are talking about...except they are aluminum.
http://www.trackerboats.com/boat/?boat=3430
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Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke.
1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.
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