Anways, since both of those have weight it means less silver and less distilled water needed. In the end I calculated my tank to hold 1200mL of water. This much water will cover the plate perfectly without spilling. In addition, my dunker was from my original smaller tank. Since S & W Plastics would charge me and arm and a leg to make another one I have come up with a simple solution.
Here is what I mean by my plate dunker. It is to short for my new silver tank and I have to go back to S&W tomorrow to have a 1.5x4.5 inch piece of 1/8th acrylic cut to add more length. It should cost me under $8.00. A new whole plate silver bath tank costs over $100, not including shipping. So far I am in under $20.00.