There is a gap in the freezer door surrounding the ice chute where ice builds, then later melts. This process is causing rust on the outside of the door as water drips out. I checked with your representative (and the web) but there no part sold for this. The gap is about 6" x 4" x 3" . I'm looking for some safe insulation, probably foam insulation, I could insert into the gap. But where I can I find insulation that is safe with the respect the food.