Okay so I don't really have the foggiest notion what they are called !!! My 1985 Uhaul, and I suspect Burros, use what appears to be a 1/4 by 1/4 inch by maybe 1/16 inch thick flat solid gelatin like material when screws are run through the interior walls to attach items. This "device" acts kinda like a lock nut. Does anyone know what they are called and more importantly where you can get them ? Thanks Lee
We have several of these in our privacy room of the UHaul
VT. They appear to be wall anchors, but I don't know if they are specific to fiberglass walls. There used to be a mirror attached by screws using these, but they are just there by themselves now. It looks like you drill the hole, snap them in, then run the screw through them just like you would for a plaster or drywall construction in a house. I would check for wall anchors at a Lowe's or Home Depot.