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Most toilet seats are interchangeable so it is not REQUIRED that you match your existing seat exactly. However if that is your preference I would start with getting the Kohler Ink stamped number from under the lid of the toilet tank Or on the side (inside) of the tank itself. It will start with a "K" of course. That will help me get the toilet model number and if you would be so kind as to send me a photo of the existing seat I will get anumber for you. I hope the mornign is sufficient though as I just checked in tonight before going to bed.