#1. 2004-06. CONVERTIBLE. PartQualifier: #1. Reinforcement nut. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Partition Panel. Bumper Cover Reinforcement Beam Nut. Bumper Cover Reinforcement Nut. Bumper Impact Bar Nut. Nut to secure Bumper Cover. Included with: Reinforcement.