Heater Box

I'm in the process of putting the rest of my 67 dart heater box together and of course somehow I have deleted all my phone photos. Im at the door which has the rubber bumper on it. Using the rebuild kit is there any foam the goes on this door? I don't recall when it came out that there was anything on it. Also what purpose does the bumper serve? Can it come off and not affect the doors operation? The staple was a pain to get off.