Mine were about 6' x 20" and very heavy. They were installed above deck, under the gunwales of the old Dyer. I went aluminum and had them custom made for below deck.I have some old reclaimed tanks in the workboat. Orange gelcoat, long cylindrical tanks. 50 gallons each. They are strange with a cap at the end that has a kinda hex pattern. I was told they were from a hinckley...but I don't really know for sure.