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Assuming that you have a standard wood center console, I can tell you that one can fit (2) 12 gallon metal tanks under there. There is just enough room for the filler caps and the plumbing. Two tanks side by side will give you about one inch width to spare (just enough but not too much) and it fits just behind the wood dowel rod. I have four of these tanks (restored) and painted in original red that I don't use. Personally, I can't see needing that much fuel. I run with two six gallon metal tanks and a 100HP 4 stroke Yamaha. I can go more than all weekend constantly at 4000 RPM and not use it up.