Do too the shape of the stern and location of the tie down strap’s I could only make them 14x10x8 so length times width times height equals 1120×2, since there’s two of them equals 2240÷231 in.² per gallon equals 9.690×8.3 pounds per gallon equals 80.87 pounds of flotation basically eliminating two batteries. or in my case since the new motor I put on is 100 pounds heavier than the factory. I’m just about back to normal. once the ice is gone, I’ll post some before and after photo and TopSpeed.