If your tank is the same as mine, the picture shows the approximate dimensions. I ended up pulling my tank and bringing it to a local builder to have them duplicate it. I had them build it out of heavier gauge aluminum. There are angle brackets at the front and back so the tank is screwed to the lower deck. Campion threw a few thin pieces of rubber material under the tank, but not enough to keep the tank from rubbing on deck below it because they didn't put anything under the angle brackets. The combination of the tank in a saltwater bilge and rubbing on a rough surface finally did it in. I got some neoprene strips and used 3M 5200 to adhere and seal them to the bottom of the tank. I'm also spacing the angle brackets off the deck. The thicker tank and a bit of air gap should help it last. I understand that some people use coal tar epoxy to completely seal their tank before install. I don't think that will be necessary.