How to connect these defrost hoses

Yes,.that's what I was talking about. See how you have the bushing in the vent in the picture of the vent to the right? Perfect! Now take the hose and put it into the bushing ( clear silicone on it first) and then put a nice bead of clear silicone around the edge. Done!! :)

Edit: put a small bead of clear silicone around the bushing before you install into the vent also.