My Kubota bed corner filler is starting to disappear. Over time it didn't seem really comfortable anymore. I took some measurements as I couldn't find an official Kubota part and came up with these. They have a lot of "fins" and are really snug fitting so it takes some pressure to slide them in. I don't think they will come on their own any time soon. You look pretty good too. much better than the empty square end of the pipe.