tdragger, I took a Stebel horn apart and mounted it in the right side, behind the radiator and screen.
My add-on fuse box is in this location, along with the keyless Digital Guard Dawg control unit.
With an evap, only one out of the three hose would be left, this would be the coolant tank over flow tube. The evap designed to keep fuel from entering/leaking into the environment.