The 12" version is likely going to be too close to the wall and the lid will likely interfere with installation. A 10" toilet will have a slightly larger gap, but you will be able to install it into your space. Your American Standard Consumer Connection Team.
Dumpmaster, these will have the same features. Sincerely, American Standard Tech Team
Yes, this would have a fully glazed trap way.
Any elongated seat will work with this model. -American Standard Tech Team
The 4021 is the Cadet model, please contact us directly through the American Standard website "Contact Us" located at the bottom of our home page so we can assist you. Sincerely, American Standard Tech Team
The washer would go inside the tank. -American Standard Tech Team
I measure 6" down from rim to water surface after a fresh flush and waiting for the tank to re-fill.
This toilet does not require a special seat. As long as you get an elongated seat, it will fit.
It would be very tight. I would recommend dry roughing it in first to make sure the tank isn't into the wall.
I measure 30-3/4" from the floor to the top of the cover on the water tank. Thanks.