Nothing. There are two small metal pieces (tabs) that stick up from one of the parts of the floor board just below and other above the dimmer switch. The tabs are a bit less than 2 inches long, 1/4” wide and stick up about 1/4”. They don’t touch the fiberboard panel and seems to only limit the panel movement on the bottom end. The only fasteners I’m aware of are clutch screws that hold the panel retainer to the door frame, as shown in the photo above.
Some of the parts vendors might sell the fiberboard panels?
Last edited by 46Sparky; 03/28/2023 3:04 AM. Reason: Added panel source information