There are several Toto models that can be adapted to 10", but the real problem is the round bowl. There are a few, but none that will adapt to 10". You might examine Terry's Report On Low Flow Toilets linked off of the home page and look at the models that can be adapted and note the depth on the spec page. Some elongated bowls are really not much deeper than a round bowl. Keep watching your thread. There are several pros that deal with Toto toilets and have much more detailed knowledge.