It's designed for the bolts to be 12" from the wall, so add 1.5" to the spec sheet's dimmensions. I don't remember if it is available with a 14" rough-in, if it is, it may fit and then it would be 1/2" less than normal. Some of the other models of Totos also come with 14" rough-ins. Keep in mind, some toilets actually move the whole thing one way or the other, some just put a bigger tank on. If they just use a bigger tank, it will stick out more.