These are the plastic nubbins that cover the latch that holds the door closed/locked. The metal piece is mounted externally on the door and is U shaped. It has a square protrusion that has a plastic cover or nubbin on it. With it, the door latch is quiet, with out, it makes a bang type of noise when closed. If noone has a set, anyone know of a source for the part? Besides a junk yard.