I know this must sound crazy but, my wife got a flat and had it changed using Volvo roadside assistance. I was not there to see how it should go back in correctly. I tried to get everything back in place but it does not seem to fit correctly. I have a third seat and it must be placed correctly for the floor to be positioned it the right spot. In what position and order do the parts go in? Where does the hard styrofoam ring go and which side is up?