I see, is that foam a grey coloured high density foam about 1/4" thick and self adhesive backing on one side? If it is, you might try the various home inprovement centers and make the flap/door gaskets or coverings yourself. or you could try and contact
www.classicautoair.com and see what they say although they dont offer that part specifically. They used to re-store the old style MoPar A/C/ Heater boxes. Good Luck