I've looked for replacements but the parts guys at the local RV shops all give me that "deer in the headlights" stare when I ask for bungee buttons or "those little circular deals that hold the bungee cords in place under the bunk and that keep the bunkend sidewalls snug". Any of the simple solutions I've tried or considered either don't hold up, damage the endwall trim, are hard to find, take forever to get here or are just too expensive. While perusing the local hardware store this weekend, I finally came up with a method that will be infinitely more durable and that will easily outlast the stock plastic or metal bungee buttons that are screwed to the underside of the bunkends. The problem I came across was that whatever I tried inevitably ended up being sheared off, bent or otherwise destroyed by the endwall trim while pulling the bunkends out or pushing them back in. While this is by no means a "bulletproof" solution but the components are easy to find, are certainly more durable, work very well and it's easy enough to do. I spied an assortment of adjustable metal and rubber chair glides with 1/4" bolts. I chose the 1-1/16" (26mm) chair glides ($3.99 ea). To make installation easier and to prevent the mattresses from being torn over time, I opted to mount the chair glides to the undersides of the bunks using "T" nuts ($0.15 ea). The chair glides seem pretty durable, they've got a natural groove in them making them easy to wrap bungee cord around and they've got a solid mounting bolt built in. I removed the remaining (and badly damaged) bungee buttons from the underside of the extended front bunk, then drilled 5/16" holes in the same screw holes. I then knocked in the "T" nuts with a hammer and removed the plastic adjustment sleeves from the chair glides. With the "T" nuts flushed and seated into the plywood, I spun the the chair glides into the "T" nuts from under the bunk and snugged them up with a pair of pliers. Rinse and repeat on the rear bunk and viola! They work like a charm and they're about the same height as the factory installed plastic bungee buttons. Obviously, the thing to remember now is to lift up when pulling the bunks out or pushing them back in. In the event that I damage or destroy these through brute strength, utter carelessness and/or total incompetence, they're simple enough to replace.