In the inside rear corners of my truck bed (F250), below the rails but off the deck, are existing holes where I'd like to use some sort of eyebolts as attachment points for securing loads. It's a PITA to get a bungee or strap hook in them, especially if I'm tying into the corner something like a propane tank. I'd like to utilize these holes instead of drilling for cleats, but I'm not sure if there's a product available that would slip into the hole and have some means of staying put (i.e., not falling into the hole, or out of the hole). Anybody got a solution?