So after putting it off for several years, I finally pulled the dash on my 2001 Cherokee to replace the bad evaporator core heater core, and old fan motor. The foam that is stuck on the top and ends of the core are good. Actually, I can peel them off and glue them to the new core. The problem is the molded styrofoam piece in the bottom of the box. Where the lead was it ate away the front 1/3 of the bottom. From there back is in decent shape. For those of you who have ran into this, what did you use to replace it?