Toto does not include a toilet seat with their two piece toilets, you will have to purchase one seperately. Once you add this item to your cart, a seat is recommended
Yes. The model number for solely the bowl component is listed under item # C423EFG#01. You can view & purchase the component here
The measurement from the front of of the rim of the toilet bowl to the back of the tank is 26 1/8".
The CST423EFG does have a sanagloss feature for this toilet.
Sanagloss is where they bake an extra leyer into the toilet bowl to make it a trully smooth surface and it help make it easier to clean and you don't really get the mold and mildew stains in the bowl so much anymore.