If you go to Lowes, they carry a sheet of fiberglass that is 8 square feet for about $7.00. You can also get a gallon of fiberglass resin for $35. I personally would pull the old scoop out as carefully as possible, then lay the fiberglass cloth on the inside of the old scoop to reinforce it, and then exend it down. Personally, if I were to do it, I'd get blocks of styrofoam and then carve it out with serrated knife and then rough sand paper. Then, find a box of Reynolds easy release foil. Spray the styrofoam with spray adhesive, then put the non release side on the foam. Now you have a form. Put that on the end of the fridge scoop, then lay fiberglass the full area you want to cover. Glass the whole thing, and trim the edges later. Finally, flip it over, use bondo to smooth the connection and you should be golden (if you want to go through the trouble to make it look like it's supposed to be there.