If you are going to do the measurement route, I strongly suggest you make a mockup of your tank out of scrap plywood and then test fit it into the space. It is a pain in the butt, but better than wasting money on a new tank and finding it would not fit, or needing 20 hours of glass work to modify the opening and deck. Here are some photos of my mockup to give you the idea. I modified the measurements twice - once from my test fit, and then again when Bushwacker gave me the measurements of his tank. The first time I measured it was too big to fit, and then with Bushwacker's measurements I added back some dimensions that I had reduced, increasing the capacity by a few gallons. Make sure your mockup includes the vent and fill elbows.
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