I know Toto lists water spot (Toto lists it as "Water Surface") on each toilet.
Form the Toto web site ( http://www.totousa.com/ ) Select a toilet, click on the "Downloads & Resources" tab, click on "Spec Sheet", click on models listed, located on the second page is the Water Surface size.
I don't know of an easy way to find water spot size in a more efficient manner.





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