Would this one work?

I sealed up my existing vent using expanding foam for the entire job. I sealed the opening and foamed it up from the back side. I do have some alum in the way so as it began to harden I closed the door and let the foam form around these parts. I did this mainly due to the fact that I do Winter camp in the cold and the ice maker water line runs down the back of the fridge in this open space. I came to this realization while spending Christmas in Flagstaff, AZ (-4 degrees). Glad that water line has a separate shut-off.
I spent last Winter in Detroit and it was rarely above freezing on a good day. -25 one day. With the heat generated by the fridge pumped into the back and allowed to vent through the roof, everything stayed in perfect working order.