Hi C., We ordered one from Amazon that was a little longer than the standard, Dex Products Safe Sleeper Bed Rail Ultra and we bought a standard one at Babies R Us, their brand. I like the Babies R Us one better, it was far easier to install even though they were both the same type of concept. They have arms that hook under the mattress and then a strap that goes all the way across the box spring and you pull a tab to tighten it. The sides also drop for easier bed making, our bed frame isn't tall enough for it to stay down all the time but it makes it FAR easier to change sheets! I had seen the double bed rails but at the time I bought the one from Amazon my son's bed wasn't in the middle of his room.