Only four fin boxes. I think the talk is about five different types of setup. In reality it's more like three: twin - four fins with big pair forwards - four fins with big pair in the rear. But since you can also put the rear pair forward or to the rear in the box, you get extra options if you count that.
For a quad with a single option, you have to look for a 2010 quad convertible. Another option is the 2011 EVO IQ which sets up as a twin fin or a single fin.