There are 4 rectangular rubber cushions that press into the flanged surface the tailgate closes against. I'm not sure what they are called, and have been searching around trying to find someone that makes it.
Does anyone know the piece I am talking about or where to get a replacement? Mine are dried and shriveled beyond usefullness.
EDIT-
Found them at Steele Rubber
http://www.steelerubber.com/tailgate-bumper-70-1795-71