I don't know what this material is called, it was used on new cj5's between the top of the radiator and the back side of grill. It was purpose to fill gaps and keep air flow through the radiator. It looked like a horse hair / straw material the was stapled or placed there befoer radiator was mounted. Does anyone know what I am talking about or has seen any of this material. The early mb and cj2 and 3's use a filler material , but not like this.