The thing that holds the trunk rubber is called a channel. It's the same for all 57-58 Plymouths. It was originally spot welded into the trunk area. If you have a few hours to kill, find a good one in a parts car in a junkyard and use a spot weld remover (Eastwood sells one) attached to a cordless drill to remove the three dozen or so spotwelds that hold the channel in place. Lotsa fun. Ron |