Body Trim
Think this was an option. My Demon originally had it, but since the rear quarters are the only original sheet metal on the body, I opted to remove it. The "moulding, fender side, black" slid onto what look like little nails welded into the body. The rubber strip was glued in. In some climates, the glue failed causing the rubber to flop around until it fell off or broke off.
Back in the day TRW made something like it that was on a roll and had an adhesive back.