They never made 13 toilets. It was either a 12 an inch away from the wall, or a 14 that only needed 13 inches, which most of them do, since they always allow some space for variation.: I am changing an old toilet with a Mansfield brand. The old toilet has been in the house for 25 years and is a 13 inch. I purchased the new toilet and was told they dont make 13 inch toilets anymore. Just 10, 12,14. Is it alright to have the tank 2 inches from the wall or should i support it somehow? I dont want to move the drain.