I have a 1984 Commander 410. The holding tank developed a leak and now I'm ready to replace it. It is a big job, I have to remove the saloon flooring and the center floor panel. The tank is below the engine room floor plates between the engines, tough job to get out. The old tank was made by a company called Aluminum Fabricated Products in Perry Florida which I can not find in any internet searches. I would really like to find a drawing or spec sheet for the tank so I could get the new one fabricated before tearing the boat apart. Does anyone have any suggestions? Any help will be greatly appreciated. I'm ready to get rid of the 25 gallon temporary tank.