One important number is the rough in number, or the distance from the center of the hole to the wall. Different toilets have different rough in distances. The Aquamagic 5 has a fairly shallow rough in number making it work in most applications. HOWEVER the Aquamagic 5 is a POS!!! It is made as a disposable, about the only thing repairable is the blade seal. There is no pipe that goes straight down to the floor, but opens to a internal chamber that is nearly impossible to get clean. Mine lasted 2 years and had a seal fail that was not replaceable, I had to by a new toilet. I bought a Style II. Many replaceable parts, easy to work on, china bowl, and no splash chamber. If you can fit anything other than a aqua magic 5, you should.
