Moeller Marine, maker of custom fuel tanks for many boatbuilders and replacement tanks for other boats, had a perfect replica of the old steel tank, but in a modern, roto-molded design. It came complete with a sending unit and special clips to secure the tank. It fit in the exact same footprint as the original tank. We had to make a minor adjustment to the tank platform to fasten the forward brackets, but after that, it clamped in firmly, and the fill hose, outflow and vent pipe fit precisely ($190, plastic-mart.com). We added a 10-micron fuel-water separator from Sierra for $50. Don't leave home without one of those.