I thought a dumb sounding question might get your guys and gals attention. seriously though, i have a 1976 16 ft larson tri-hull and like so many of the parts the gas tank was MIA when i recieved the boat. There is a filler cap in the rear left corner (looking at the back of the boat) so i imagine there was a permenent tank at one point. I want to put a real tank in instead of using those 6 gal red ones. any ideas? or pics?